Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
hanh dau » hang dau, danh dau, han dau
va triet » va thiet, va trien, ve triet
te sach » toc sach
tang ma » tang van
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
luc va » duc va, tuc va, loc va
dau va » dau ve, lau va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y ((tang ma) or (mang may)) hoi. hieu ve cham luc va hanh dau va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((tang ma) OR (mang may)) hoi. hieu ve cham luc va hanh dau va triet.
• Adding a wildcard symbol may retrieve word variants: te sach y ((tang ma) or (mang may)) hoi. hieu ve cham luc va hanh dau va triet*.