Perhaps you should try some spelling variations:
chiet tach » chieu sach
canh trinh » canh tranh, hanh trinh, canh tinh
hoc chiet » hoc thiet, hoc nhiet, hoc hien
ve thong » he thong, va thong, ve chong
ve phong » va phong, van phong, mo 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) OR (ve phong)) 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) OR (ve phong)) cong ((van toan) OR (dan than)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - canh trinh ((ve thong) OR (ve phong)) cong ((van toan) or (dan than)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - canh trinh ((ve thong) OR (ve phong)) cong ((van toan) or (dan than)) ban*.