Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
hai cua » thai cua, dai cua, hoi cua
van lam » van nam
nang xa » lang xa, nang ma, mang xa
xac ky » cac ky, sac ky, bac ky
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
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) or (nang x)) hoi. hieu van lam ((xuc va) OR (luc va)) thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky ((nang xa) OR (nang x)) hoi. hieu van lam ((xuc va) OR (luc va)) thanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky ((nang xa) or (nang x)) hoi. hieu van lam ((xuc va) OR (luc va)) thanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: su xac ky ((nang xa) or (nang x)) hoi. hieu van lam ((xuc va) OR (luc va)) thanh hai cua tre*.