Perhaps you should try some spelling variations:
cac truc » cau truc, cac tru, cac trung
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
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
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
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 truc va dan 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 truc va dan 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 truc va dan vi lua tre*.