Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham luc » cham soc, nhan luc, cham cuu
hang lap » sang lap, hang la, hang tap
ban hang » ngan hang
cua tre » cuu tre, cua triet, dua tren
luc ban » duc ban, cuc ban, luc bat
ve cham » va cham, ve chat, vu cham
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
tai hai » thi hai, dai hai, tai ha
tai hoi » tai khoi, dai hoi, tai hoe
ty hang » ly hang, ty xang, thi hang
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: toc sach ty hang ((tai hoi) or (tai hai)). hieu ve cham luc ban hang lap ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty hang ((tai hoi) OR (tai hai)). hieu ve cham luc ban hang lap ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: toc sach ty hang ((tai hoi) or (tai hai)). hieu ve cham luc ban hang lap ((cua tre) or (cua te))*.