Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
van hanh » van thanh, ban hanh, van anh
thai cua » tri cua, dai cua, hoi cua
than cua » nhan cua, ban cua, gian cua
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
nang o » nang co, nang ho, nang ro
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. hieu vien cac xuc van hanh ((((thai cua) OR (than cua))) or (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang o hoi. hieu vien cac xuc van hanh ((((thai cua) OR (than cua))) OR (tai cuc)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang o hoi. hieu vien cac xuc van hanh ((((thai cua) OR (than cua))) or (tai cuc)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang o hoi. hieu vien cac xuc van hanh ((((thai cua) OR (than cua))) or (tai cuc)) tre*.