Perhaps you should try some spelling variations:
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang xa) or (lang xa)) hoi. ((hieu ve) or (hieu va)) cac luc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (lang xa)) hoi. ((hieu ve) OR (hieu va)) cac luc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (lang xa)) hoi. ((hieu ve) or (hieu va)) cac luc va hanh vi cua tre*.