Perhaps you should try some spelling variations:
hieu ve » hieu va, hieu van
doan vi » doan va, don vi, doan thi
ca doan » ca dan, chan doan, cac doanh
cac tuc » cac toc, cac tu, cac tac
te sach » toc sach
lua tre » cua tre, luy tre, dua tren
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
tuc ca » tuc cac, tuc cua, tuc xa
vi lua » vi luu
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho

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 y nang ((((x hoi) or (5 hoi))) or (o hoi)). hieu ve cac tuc ca doan vi lua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((((x hoi) OR (5 hoi))) OR (o hoi)). hieu ve cac tuc ca doan vi lua tre.
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((((x hoi) or (5 hoi))) or (o hoi)). hieu ve cac tuc ca doan vi lua tre*.