Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thanh vai » thanh van, thanh tai, thanh oai
hieu van » thien van, lieu va, hieu ve
cua tre » cua te, cuu tre, cua triet
lam luc » lao luc, lam duoc
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
luc va » duc va, tuc va, loc va
xac ky » cac ky, sac ky, bac ky
su xac » pu xac, su cac

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

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