Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cham luc » cham soc, nhan luc, cham cuu
tu sach » thu sach, su sach, te sach
su tien » su kien, su hien, tu tieng
luc van » luoc van, luu van, duc van
sach tu » sach thu, cach tu, sach ty
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
su bien » su kien, su hien, so bien

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 tu ((nang xa) or (nang x)) hoi. hieu ve cham luc van hanh vi ((su tien) or (su bien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu ((nang xa) OR (nang x)) hoi. hieu ve cham luc van hanh vi ((su tien) OR (su bien)).
• Adding a wildcard symbol may retrieve word variants: tu sach tu ((nang xa) or (nang x)) hoi. hieu ve cham luc van hanh vi ((su tien) or (su bien))*.