Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
van lam » van nam
dinh vi » dinh ve, dinh viet, dinh tri
cua tre » cua te, cuu tre, cua triet
te sai » te bai, te lai, te hai
xuc va » tuc va, luc va, xac va
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: ((te sai) or (te tai)) ky tang xa hoi. hieu van lam ((xuc va) OR (duc va)) dinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sai) OR (te tai)) ky tang xa hoi. hieu van lam ((xuc va) OR (duc va)) dinh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sai) or (te tai)) ky tang xa hoi. hieu van lam ((xuc va) OR (duc va)) dinh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sai) or (te tai)) ky tang xa hoi. hieu van lam ((xuc va) OR (duc va)) dinh vi cua tre*.