Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
van hanh » van thanh, ban hanh, van anh
mat cua » ma cua, manh cua, mang cua
cat cua » chat cua, ca cua, cau cua
luc van » luoc van, luu van, duc van
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
sach v » sach va, sach y, sach 2
ma hoi » mai hoi, ma hoa, me hoi
v nang » va nang, vu nang, van nang

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