Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
hoi nang » hoi lang, ho nang, hoa nang
hanh tai » thanh tai, hang tai, han tai
sach hoi » sach doi, sach moi, cach thoi
tu sach » thu sach, su sach, te sach
cuu tre » cua tre, cau tren, cau treo
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
nang ma » tang ma, sang ma, nang cao
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 hoi nang ma hoi. hieu vu cham luc va ((hanh tai) or (((hang va) or (hanh vi)))) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi nang ma hoi. hieu vu cham luc va ((hanh tai) OR (((hang va) OR (hanh vi)))) cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach hoi nang ma hoi. hieu vu cham luc va ((hanh tai) or (((hang va) or (hanh vi)))) cuu tre*.