Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
tu cach » tu cac
cach tu » cach thuc
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
nam xua » nam cua, nam mua, nam qua
xua ban » xuat ban, cua ban, qua ban
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cach tu nang xa hoi. hieu van nam xua ban hanh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach tu nang xa hoi. hieu van nam xua ban hanh vi ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu cach tu nang xa hoi. hieu van nam xua ban hanh vi ((cua tre) or (cua te))*.