Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
van lam » van nam
duoc va » duc va, duoc ma, duong va
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky nang x ho. hieu van lam ((duoc va) OR (nuoc va)) hanh vai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang x ho. hieu van lam ((duoc va) OR (nuoc va)) hanh vai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang x ho. hieu van lam ((duoc va) OR (nuoc va)) hanh vai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang x ho. hieu van lam ((duoc va) OR (nuoc va)) hanh vai ((cua tre) or (cuu tre))*.