Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh lap » thanh san, phan lap, thanh hai
doc sach » toc sach, nuoc sach, dac sac
cham luc » cham soc, nhan luc, cham cuu
hoc sach » hoc sinh, hoc cac, hoc anh
cua tre » cuu tre, cua triet, dua tren
luc ban » duc ban, cuc ban, luc bat
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
tai hoi » tai khoi, dai hoi, tai hai
ty dung » tay dung, ly dung, te dung
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: ((doc sach) or (hoc sach)) ty dung tai hoi. hieu ve cham luc ban thanh lap ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (hoc sach)) ty dung tai hoi. hieu ve cham luc ban thanh lap ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: ((doc sach) or (hoc sach)) ty dung tai hoi. hieu ve cham luc ban thanh lap ((cua tre) or (cua te))*.