Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
sach kem » hanh kem
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
xuc va » duc va, tuc va, luc 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: thu ((sach kem) or (sac ky)) nang xa hoi. ((hieu quan) or (hieu qua)) cam xuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach kem) OR (sac ky)) nang xa hoi. ((hieu quan) OR (hieu qua)) cam xuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: thu ((sach kem) or (sac ky)) nang xa hoi. ((hieu quan) or (hieu qua)) cam xuc va hanh vi cua tre*.