Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
su cach » su sach, tu cach, su cac
cach tu » cach thuc
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
duc ban » duc van, dua ban, duc man
cua tre » cua te, cuu tre, cua triet

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

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