Perhaps you should try some spelling variations:
van khanh » van thanh, van hanh, van anh
cua triet » cua viet, su triet, va triet
khanh lai » khanh luan, thanh lap, thanh loi
vu khach » vu khanh, vu khac, vay khach
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
nam tuc » nam thuc, nam truc, nam tu
tuc van » thuc van, truc van, tuc va
nang ma » tang ma, sang ma, nang cao
su tien » su kien, su hien, tu tieng
y nang » ky nang, ly nang, v nang

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) or (vu khach)) y nang ma hoa. hieu van nam tuc van khanh lai ((cua triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu khach)) y nang ma hoa. hieu van nam tuc van khanh lai ((cua triet) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) y nang ma hoa. hieu van nam tuc van khanh lai ((cua triet) or (su tien))*.