Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
ban thanh » ban hanh, ban hang
cua viet » ca viet, hoa viet, cua vat
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
cam thu » nam thu, cac thu, ca thu
thu ban » thu hang
vu sach » vu bach, su sach, vu khach
mai hoi » mai khoi, dai hoi, lai hoi
van cam » van nam, van lam, van cau
y nang » ky nang, ly nang, v nang
ma hoi » xa hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y nang ((ma hoi) or (mai hoi)). hieu van cam thu ban thanh van ((su triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang ((ma hoi) OR (mai hoi)). hieu van cam thu ban thanh van ((su triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: vu sach y nang ((ma hoi) or (mai hoi)). hieu van cam thu ban thanh van ((su triet) or (cua viet))*.