Perhaps you should try some spelling variations:
dua tren » dung tren
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
duc ban » duc tan, duc van, dua ban
qua cac » cua cac
qua cam » qua cham, qua ca, qua cai
tang xa » trang xa, tang ma, lang xa
ty tang » tay tang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo

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 ty tang xa hoi. hieu ((qua cam) or (qua cac)) duc ban hanh vi ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty tang xa hoi. hieu ((qua cam) OR (qua cac)) duc ban hanh vi ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty tang xa hoi. hieu ((qua cam) or (qua cac)) duc ban hanh vi ((dua tren) or (cuu tre))*.