Perhaps you should try some spelling variations:
danh sai » dung sai, danh bat, danh dau
danh vai » danh va, doanh van, dang van
kho tang » cao tang
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
lam xuc » cam xuc, lam duoc
van lam » van nam
ky tang » ky nang, ky dang, ky trong
xuc va » duc va, tuc va, luc va
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ((ky tang) or (kho tang)) xa hoi. hieu van lam xuc va ((danh vai) OR (danh sai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ((ky tang) OR (kho tang)) xa hoi. hieu van lam xuc va ((danh vai) OR (danh sai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ((ky tang) or (kho tang)) xa hoi. hieu van lam xuc va ((danh vai) OR (danh sai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ((ky tang) or (kho tang)) xa hoi. hieu van lam xuc va ((danh vai) OR (danh sai)) cua tre*.