Perhaps you should try some spelling variations:
"thuat sach than ky thuat co hoc" » "thuat lanh than ky thuat co hoc", "thuat san than ky thuat co hoc", "thuat sach tham ky thuat co hoc", "thuat sach han ky thuat co hoc", "thuat sach tranh ky thuat co hoc", "thuat sach than ky thuat do hoc", "thuat sach than ky thuat o hoc"
"tu can trinh do thuat toan khoa" » "tu can tranh do thuat toan khoa", "tu dan trinh do thuat toan khoa", "tu van trinh do thuat toan khoa", "tu can trinh ky thuat toan khoa", "tu can trinh hoc thuat toan khoa", "tu can trinh ki thuat toan khoa", "tu can trinh do thai toan khoa", "tu ban trinh do thuat toan khoa", "tu cac trinh do thuat toan khoa", "thu canh trinh do thuat toan khoa", "tu can trinh do thuat tran khoa"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("thuat sach than ky thuat co hoc") OR ("tu can trinh do thuat toan khoa"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"thuat sach than ky thuat co hoc\") OR (\"tu can trinh do thuat toan khoa\"))*".
• Removing quotes may allow a broader search: (( thuat sach than ky thuat co hoc ) OR ( tu can trinh do thuat toan khoa ))*.