Perhaps you should try some spelling variations:
ban thinh » ban thanh, ban tinh, van thinh
sach thue » sach thu, sach thieu, sach tham
hieu van » thien van, lieu va, hieu ve
thinh le » trinh ly
hieu va » lieu va, hieu qua
tuc ban » thuc ban, truc ban, tu ban
cam tuc » cam xuc, cam tu, nam thuc
sach ty » sach y, sach tu, sach thu
va hoi » xa hoi, va hoc, va hoa
le cua » ly cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sach thue)) hang va hoi. ((hieu van) OR (hieu va)) cam tuc ban thinh le cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thue)) hang va hoi. ((hieu van) OR (hieu va)) cam tuc ban thinh le cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach thue)) hang va hoi. ((hieu van) OR (hieu va)) cam tuc ban thinh le cua vat".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thue)) hang va hoi. ((hieu van) OR (hieu va)) cam tuc ban thinh le cua vat*.