Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
cham luc » cham soc, nhan luc, cham cuu
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
te sach » toc sach
hieu ve » hieu va, hieu van
tang ma » tang van
ve cham » va cham, ve chat, vu cham
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 ((van hanh) OR (ban 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 ((van hanh) OR (ban hanh)) dau va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((tang ma) or (mang may)) hoi. hieu ve cham luc ((van hanh) OR (ban 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 ((van hanh) OR (ban hanh)) dau va triet*.