Perhaps you should try some spelling variations:
chiet tach » chieu sach
nhung cong » dung cong, thong cong, hang cong
hoc chiet » hoc thiet, hoc nhiet, hoc hien
trinh van » trinh han, trinh quan, trinh toan
trinh va » trinh vat, trinh ve, trinh vi
dan toan » van toan, manh toan, xuan toan
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 - hanh ((trinh va) OR (trinh van)) nhung cong ((dan toan) or (dan than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - hanh ((trinh va) OR (trinh van)) nhung cong ((dan toan) OR (dan than)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - hanh ((trinh va) OR (trinh van)) nhung cong ((dan toan) or (dan than)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - hanh ((trinh va) OR (trinh van)) nhung cong ((dan toan) or (dan than)) ban*.