Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
dua tren » dung tren
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
luc van » luoc van, luu van, duc van
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
y sang » _ sang, duy sang
ma hoi » mai hoi, ma hoa, me hoi
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: tu sach y sang ((ma hoi) or (xa hoi)). hieu ve cham luc van hanh lai ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y sang ((ma hoi) OR (xa hoi)). hieu ve cham luc van hanh lai ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach y sang ((ma hoi) or (xa hoi)). hieu ve cham luc van hanh lai ((dua tren) or (cua te))*.