Perhaps you should try some spelling variations:
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
cua tre » cua te, cua triet, dua tren
luc ban » duc ban, cuc ban, luc bat
cac luc » cau luc, coc luc, cac nuoc
cuu tre » cau tren, cau treo
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
tang xa » trang xa, tang ma, tang ha
ve cac » va cac, vien cac

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 y ((tang xa) or (lang xa)) hoi. hieu ve cac luc ban hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((tang xa) OR (lang xa)) hoi. hieu ve cac luc ban hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach y ((tang xa) or (lang xa)) hoi. hieu ve cac luc ban hanh vi ((cua tre) or (cuu tre))*.