Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
hanh dai » hanh tai, hanh dao, vanh dai
sach ky » sach y, sach ty, sach kem
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, x ho

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