Perhaps you should try some spelling variations:
chiet tach » chieu sach
canh trinh » canh tranh, hanh trinh, canh tinh
thong cong » trong cong, tong cong, thong thong
hoc chiet » hoc thiet, hoc nhiet, hoc hien
trinh ve » trinh he, trinh va, trinh vi
ve thong » he thong, va thong, ve phong
van toan » van tuan, van tan, van thanh
dan than » dan chan, ban than, van than

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chiet tach - canh trinh ve thong cong ((van toan) or (dan than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - canh trinh ve thong cong ((van toan) OR (dan than)) ban.
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - canh trinh ve thong cong ((van toan) or (dan than)) ban*.