Perhaps you should try some spelling variations:
nang dai » nang dau, nang tai, lang dai
cham luc » cham soc, nhan luc, cham cuu
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang du » nang tu, nang luc, nang doc
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
luc van » luoc van, luu van, duc van
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky ((nang dai) or (nang du)) hoi. hieu ve cham luc van hanh dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((nang dai) OR (nang du)) hoi. hieu ve cham luc van hanh dai cua tu*.