Perhaps you should try some spelling variations:
"su sach danh ky thuat do hoc" » "su sach tranh ky thuat do hoc", "su sach dao ky thuat do hoc", "su sach dung ky thuat do hoc", "so sach danh ky thuat do hoc", "vu sach danh ky thuat do hoc", "su sach hanh ky thuat do hoc", "su sach dan ky thuat do hoc", "su sach dang ky thuat do hoc", "su sach danh ky thuat co hoc", "su sach danh ky thuat do hoa", "su sach danh ky thuat du hoc", "su sach danh ky thuat dco hoc", "su sach danh ky thuat dmo hoc", "su sach danh ky thuat dso hoc"
"thu lanh dao ky thuat o hoc" » "thu canh dao ky thuat o hoc", "thi lanh dao ky thuat o hoc", "thu anh dao ky thuat o hoc", "thu lanh cao ky thuat o hoc", "thu lanh dan ky thuat o hoc", "thu lanh do ky thuat o hoc", "thu lanh dao ky thuat co hoc", "thu lanh dao ky thuat mo hoc", "thu lanh dao ky thuat so hoc"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("su sach danh ky thuat do hoc") or ("thu lanh dao ky thuat o hoc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("su sach danh ky thuat do hoc") OR ("thu lanh dao ky thuat o hoc")).
• Removing quotes may allow a broader search: (( su sach danh ky thuat do hoc ) or ( thu lanh dao ky thuat o hoc )).
• Adding a wildcard symbol may retrieve word variants: (("su sach danh ky thuat do hoc") or ("thu lanh dao ky thuat o hoc"))*.