Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
va danh » va dinh, va dan, va hanh
hieu ve » hieu va, hieu van
tu sach » thu sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
su sach » so sach, vu sach
ve cham » va cham, ve chat, vu cham
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, tuc va, loc va
vai va » mai va, dai va, lai va
hai va » hai van, thai va, hoi va

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 (su sach)) ky nang ma hoi. hieu ve cham luc va danh ((vai va) or (hai va)) thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang ma hoi. hieu ve cham luc va danh ((vai va) OR (hai va)) thieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang ma hoi. hieu ve cham luc va danh ((vai va) or (hai va)) thieu".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang ma hoi. hieu ve cham luc va danh ((vai va) or (hai va)) thieu*.