Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
cac toi » cac thoi
cac toc » cac nuoc, cac thoi
cua tre » cua te, cuu tre, cua triet
cac tuc » cac tu, cac tac, cac nuoc
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
vi cua » vai cua, di cua

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 ky tang xa hoi. hieu van ((cac tuc) or (((cac toc) OR (cac toi)))) va thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky tang xa hoi. hieu van ((cac tuc) OR (((cac toc) OR (cac toi)))) va thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky tang xa hoi. hieu van ((cac tuc) or (((cac toc) OR (cac toi)))) va thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky tang xa hoi. hieu van ((cac tuc) or (((cac toc) OR (cac toi)))) va thanh vi cua tre*.