Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
luc van » luoc van, luu van, duc van
luu tre » cuu tre, luy tre
te cac » tu cac, ve cac, te cao
tru » truc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te cac ky ((nang xa) or (nang ma)) hoi. hieu ve cham luc van hanh vi ((luu tre) OR (luu tru))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky ((nang xa) OR (nang ma)) hoi. hieu ve cham luc van hanh vi ((luu tre) OR (luu tru)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ky ((nang xa) or (nang ma)) hoi. hieu ve cham luc van hanh vi ((luu tre) OR (luu tru))".
• Adding a wildcard symbol may retrieve word variants: te cac ky ((nang xa) or (nang ma)) hoi. hieu ve cham luc van hanh vi ((luu tre) OR (luu tru))*.