Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va cham » va chat, va tham
luc van » luoc van, luu van, duc van
hanh te » hanh tu, hanh ve, hanh de
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
te cua » tue cua, le cua, de cua

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 ky) or (sach y)) nang ma hoi. hieu va cham luc van hanh te cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang ma hoi. hieu va cham luc van hanh te cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach y)) nang ma hoi. hieu va cham luc van hanh te cua tre*.