Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
sach ky » sach y, sach ty, sach kem
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
tang ma » mang may, tang van
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
va cua » va chua, via cua, ca cua

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