Perhaps you should try some spelling variations:
"te sach tranh ky thuat do hoc" » "te canh tranh ky thuat do hoc", "te sach trinh ky thuat do hoc", "te sach thanh ky thuat do hoc", "te sach hanh ky thuat do hoc", "te sach tranh ky thuat o hoc", "toc sach tranh ky thuat do hoc", "te sach tranh ky thuat co hoc", "te sach tranh ky thuat do hoa", "te sach tranh ky thuat du hoc"
"te sach nganh xay thuyet va hoc" » "te sach ngan xay thuyet va hoc", "te cac nganh xay thuyet va hoc", "te sach danh xay thuyet va hoc", "te sach nganh thay thuyet va hoc", "te sach nganh ly thuyet va hoc", "te sach nganh bai thuyet va hoc", "te sach nganh mac thuyet va hoc", "te sach nganh y thuyet va hoc", "te sach nganh ma thuyet va hoc", "toc sach nganh xay thuyet va hoc", "te sach nganh xay thuyet van 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: (("te sach tranh ky thuat do hoc") or ("te sach nganh xay thuyet va hoc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("te sach tranh ky thuat do hoc") OR ("te sach nganh xay thuyet va hoc")).
• Removing quotes may allow a broader search: (( te sach tranh ky thuat do hoc ) or ( te sach nganh xay thuyet va hoc )).
• Adding a wildcard symbol may retrieve word variants: (("te sach tranh ky thuat do hoc") or ("te sach nganh xay thuyet va hoc"))*.