Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
tu sach » thu sach, su sach, te sach
cua tre » cuu tre, cua triet, dua tren
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, mang may
luc va » duc va, tuc va, loc va
cua te » cua tu

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 ty ((nang ma) or (nang cao)) hoi. hieu ve cham luc va hanh va ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang ma) OR (nang cao)) hoi. hieu ve cham luc va hanh va ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang ma) or (nang cao)) hoi. hieu ve cham luc va hanh va ((cua tre) or (cua te))*.