Perhaps you should try some spelling variations:
van thiet » va thiet, dan thiet, can thiet
van dinh » van minh, van dich, va dinh
te sach » toc sach
hieu ve » hieu va, hieu van
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
dinh vu » dich vu, dinh ve, dinh cu
tu sach » thu sach, su sach, tu cach
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam
vu van » tu van
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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) or (te sach)) y nang ((x hoi) or (o hoi)). hieu ve cam luc van dinh vu van thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang ((x hoi) OR (o hoi)). hieu ve cam luc van dinh vu van thiet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) y nang ((x hoi) or (o hoi)). hieu ve cam luc van dinh vu van thiet*.