Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
dua tren » dung tren
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
ve cam » ve cham, ve cac, va cam
cua te » cua tu
o hoi » co hoi, o hoc, o hai
kem » kiem

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ((o hoi) or (xa hoi)). hieu ve cam luc van hanh kem ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((o hoi) OR (xa hoi)). hieu ve cam luc van hanh kem ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((o hoi) or (xa hoi)). hieu ve cam luc van hanh kem ((dua tren) or (cua te))*.