Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban thanh » ban hanh, ban hang
thanh va » thanh van, hanh va, thanh ha
su sach » so sach, vu sach
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
tuc ban » thuc ban, truc ban, tu ban
va cam » va cham, va cac, va cao
ha hoi » ha noi, xa hoi, va hoi
kien » bien, vien, tien

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 ((ha hoi) or (hoa hoi)). hieu va cam tuc ban thanh va ((cua triet) or (su kien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach _ lang ((ha hoi) OR (hoa hoi)). hieu va cam tuc ban thanh va ((cua triet) OR (su kien)).
• Adding a wildcard symbol may retrieve word variants: su sach _ lang ((ha hoi) or (hoa hoi)). hieu va cam tuc ban thanh va ((cua triet) or (su kien))*.