Perhaps you should try some spelling variations:
dat tren » dat trong, dua tren
dau tren » dau tien, dau tieng, dau trong
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
sach tu » sach thu, cach tu, sach ty
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
cau duc » cao duc, cau luc, chu duc
van cau » van dau, van hau, van chat
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
duc ban » duc tan, duc van, dua ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach tu nang xa hoi. hieu van cau duc ban hanh vi ((cua tre) or (((dau tren) OR (dat tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu nang xa hoi. hieu van cau duc ban hanh vi ((cua tre) OR (((dau tren) OR (dat tren)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tu nang xa hoi. hieu van cau duc ban hanh vi ((cua tre) or (((dau tren) OR (dat tren))))".
• Adding a wildcard symbol may retrieve word variants: su sach tu nang xa hoi. hieu van cau duc ban hanh vi ((cua tre) or (((dau tren) OR (dat tren))))*.