Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
hieu van » hieu va, thien van, lieu va
phan cua » nhan cua, than cua, phat cua
cua tre » cua te, cuu tre, cua triet
van lam » van nam
ky tang » ky dang, kho tang, ky trong
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
su sac » su sach, su cac, su xac

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

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