Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
cham vuc » cham soc, pham duc, cham cuu
van hanh » van thanh, ban hanh, van anh
thu sach » thuat sach, thuoc sach, thu hoach
vuc nang » cuc nang, vu nang, chuc nang
vuc van » duc van, luc van, thuc van
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
vi su » va su, ve su, oi su
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) vuc nang xa hoi. hieu qua cham vuc van hanh ((vi su) or (ki su)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) vuc nang xa hoi. hieu qua cham vuc van hanh ((vi su) OR (ki su)) viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) vuc nang xa hoi. hieu qua cham vuc van hanh ((vi su) or (ki su)) viet*.