Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van thanh » ban thanh, van tuan
cham luc » cham soc, nhan luc, cham cuu
vuc nang » cuc nang, vu nang, chuc nang
qua cham » qua hai, qua cac, va cham
luc van » luoc van, luu van, duc van
tu sach » thu sach, su sach, te sach
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 (thuat sach)) vuc nang xa hoi. hieu qua cham luc van thanh ((vi su) or (ki su)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) vuc nang xa hoi. hieu qua cham luc van thanh ((vi su) OR (ki su)) viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) vuc nang xa hoi. hieu qua cham luc van thanh ((vi su) or (ki su)) viet*.