Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
nam xua » nam cua, nam mua, nam qua
nam xuc » cam xuc, nam thuc, nam duoc
sach tu » sach thu, sach ty, sach uu
nang xa » nang x, lang xa, nang ma
cach tu » cach thuc
cua tre » cua te, cuu tre, cua triet
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 ((sach tu) OR (cach tu)) nang xa hoi. hieu van ((nam xuc) or (nam xua)) ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (cach tu)) nang xa hoi. hieu van ((nam xuc) OR (nam xua)) ban hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) OR (cach tu)) nang xa hoi. hieu van ((nam xuc) or (nam xua)) ban hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) OR (cach tu)) nang xa hoi. hieu van ((nam xuc) or (nam xua)) ban hanh vi cua tre*.