Perhaps you should try some spelling variations:
vu thanh » su thanh, vu khanh, cuu thanh
thanh ky » hanh ky, than ky, thanh tay
trinh vi » trinh va, trinh ve, trinh viet
hieu van » hieu va, thien van, lieu va
tinh vi » tinh voi, tinh va, dinh vi
cac toc » cac toi, cac nuoc, cac thoi
cuu tre » cua tre, cau tren, cau treo
cac tuc » cac tu, cac tac, cac nuoc
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu thanh ky tang xa hoi. hieu van ((cac tuc) or (cac toc)) va ((tinh vi) OR (trinh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu thanh ky tang xa hoi. hieu van ((cac tuc) OR (cac toc)) va ((tinh vi) OR (trinh vi)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu thanh ky tang xa hoi. hieu van ((cac tuc) or (cac toc)) va ((tinh vi) OR (trinh vi)) cuu tre*".