Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su triet » su viet, ve triet
thanh vi » hanh vi, thanh va, thanh ve
su sach » so sach, vu sach
tuc ban » thuc ban, truc ban, tu ban
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
hoa hoi » khoa hoi, hoa doi, hoc hoi
su tien » su kien, su hien, tu tieng
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach _ lang ((hoa hoi) OR (hoa hoc)). hieu va cam tuc ban thanh vi ((su triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach _ lang ((hoa hoi) OR (hoa hoc)). hieu va cam tuc ban thanh vi ((su triet) OR (su tien))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach _ lang ((hoa hoi) OR (hoa hoc)). hieu va cam tuc ban thanh vi ((su triet) or (su tien))*".