Perhaps you should try some spelling variations:
hanh chat » hanh cat, hanh cham, thanh cham
cham luc » cham soc, nhan luc, cham cuu
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
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
va viet » san viet, mai viet, dao viet
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang ma hoi. hieu va cham luc van hanh chat ((va viet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ma hoi. hieu va cham luc van hanh chat ((va viet) OR (hoa viet)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ma hoi. hieu va cham luc van hanh chat ((va viet) or (hoa viet))*.