Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
ban hang » ngan hang
tu sach » thu sach, su sach, te sach
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
luc ban » duc ban, cuc ban, luc bat
hang vi » hang va, hanh vi, hang di
vi cua » vai cua, di cua

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 ((sang ma) or (nang ma)) hoi. hieu ve cham luc ban hang vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((sang ma) OR (nang ma)) hoi. hieu ve cham luc ban hang vi cua vat.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((sang ma) or (nang ma)) hoi. hieu ve cham luc ban hang vi cua vat*.