Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
cua viet » ca viet, hoa viet, cua dieu
tu sach » thu sach, su sach, te sach
ha nang » kha nang, hoa nang, da nang
nang ma » tang ma, sang ma, nang cao
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, tuc va, loc 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 (thu hoach)) ha nang ma hoi. hieu vu cham luc va hanh vi ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ha nang ma hoi. hieu vu cham luc va hanh vi ((cua viet) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ha nang ma hoi. hieu vu cham luc va hanh vi ((cua viet) or (cua vat))*.