Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
sua viet » su viet, lua viet, qua viet
vu khach » vu khanh, vu khac, vay khach
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
tuc van » thuc van, truc van, tuc va
tu sach » thu sach, su sach, te sach
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
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: ((tu sach) or (vu khach)) ky tang xa hoi. hieu va cam tuc van hanh tai ((sua viet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu khach)) ky tang xa hoi. hieu va cam tuc van hanh tai ((sua viet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu khach)) ky tang xa hoi. hieu va cam tuc van hanh tai ((sua viet) or (cua viet))*.