Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
dang xay » dang van, van xay
hang vi » hang va, hanh vi, hang di
va hang » van hang, va nang, va lang
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san

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 (dang xay)) hoi. ((hieu van) or (hieu va)) cam duc va hang vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (dang xay)) hoi. ((hieu van) OR (hieu va)) cam duc va hang vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (dang xay)) hoi. ((hieu van) or (hieu va)) cam duc va hang vi cua tre*.