Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
va dinh » van dinh, va kinh, va tinh
va danh » va dan, va hanh, dia danh
ve cham » va cham, ve chat, vu cham
lap hai » lap lai, lap hoat, lanh hai
hieu ve » hieu va, hieu van
ky sang » ky nang, ky dang, ky tang
vi cua » vai cua, di cua
cua te » cua tu

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 sang ((lap hai) OR (lap tai)). hieu ve cham luc ((va danh) or (va dinh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky sang ((lap hai) OR (lap tai)). hieu ve cham luc ((va danh) OR (va dinh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky sang ((lap hai) OR (lap tai)). hieu ve cham luc ((va danh) or (va dinh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: so sach ky sang ((lap hai) OR (lap tai)). hieu ve cham luc ((va danh) or (va dinh)) vi cua te*.