Perhaps you should try some spelling variations:
bieu hien » dieu hien, bien phien, bien nien
hanh xuc » hanh xu, hanh phuc, hanh duoc
huu them » huu thu, huu thuc, huu liem
te sach » toc sach
sach ky » sac ky, sach y, sach ty
xuc may » xuc hay, truc may, phuc may
tinh va » tich va, trinh van, trinh vat
nang o » nang co, nang ho, nang ro
va huu » vu huu
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: te sach ky nang o hoi. ((bieu hien) or (dieu khien)) hanh xuc may tinh va huu them~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang o hoi. ((bieu hien) OR (dieu khien)) hanh xuc may tinh va huu them.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang o hoi. ((bieu hien) or (dieu khien)) hanh xuc may tinh va huu them*.