Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
vu cham » va cham, vu kham, tu cham
sach tu » sach thu, sach ty, sach uu
hieu vu » hieu va, hieu ve, hieu su
lang ha » long ha
cach tu » cach thuc
ha hoi » hoa hoi, ha noi, xa hoi
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: toc ((sach tu) OR (cach tu)) lang ha hoi. hieu vu cham luc va ((kinh te) or (dich te)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach tu) OR (cach tu)) lang ha hoi. hieu vu cham luc va ((kinh te) OR (dich te)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach tu) OR (cach tu)) lang ha hoi. hieu vu cham luc va ((kinh te) or (dich te)) cua te".
• Adding a wildcard symbol may retrieve word variants: toc ((sach tu) OR (cach tu)) lang ha hoi. hieu vu cham luc va ((kinh te) or (dich te)) cua te*.