Perhaps you should try some spelling variations:
chiet tach » chieu sach
hoc chiet » hoc thiet, hoc nhiet, hoc hien
hang cong » dang cong, hang nong, bang cong
tranh va » tranh van, trang va, thanh va
trinh va » trinh van, trinh vat, trinh ve
cong san » cong tac
toan ban » van ban

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 ((tranh va) OR (trinh va)) hang cong san ((toan tap) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - canh ((tranh va) OR (trinh va)) hang cong san ((toan tap) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - canh ((tranh va) OR (trinh va)) hang cong san ((toan tap) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - canh ((tranh va) OR (trinh va)) hang cong san ((toan tap) or (toan ban))*.