Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
lang xa » dang xay, lang van
lang ha » long ha
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
te sac » te sach, te cac, te san
te va » tu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky ((lang xa) or (lang ha)) hoi. hieu ve cham luc va hanh ((te va) or (ke va)) trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((lang xa) OR (lang ha)) hoi. hieu ve cham luc va hanh ((te va) OR (ke va)) trien.
• Adding a wildcard symbol may retrieve word variants: te sac ky ((lang xa) or (lang ha)) hoi. hieu ve cham luc va hanh ((te va) or (ke va)) trien*.