Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
dua tren » dung tren
vien cac » vien bach, vien dai, vien da
te sach » toc sach
luy tre » luyen tre
cac luc » cau luc, coc luc, cac nuoc
va dan » ca dan, va dao, va dap
y nang » ky nang, ly nang, v nang
va dau » va dao
x hoi » xa hoi, o 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. hieu vien cac luc ((va dan) or (va dau)) vi ((dua tren) or (luy tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang x hoi. hieu vien cac luc ((va dan) OR (va dau)) vi ((dua tren) OR (luy tre)).
• Adding a wildcard symbol may retrieve word variants: te sach y nang x hoi. hieu vien cac luc ((va dan) or (va dau)) vi ((dua tren) or (luy tre))*.