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
lang van » dang van, tang van, hoang van
sach thi » sach thu, sach tai, sach thieu
hanh de » hanh ve, hanh kem
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
te sach » toc sach
nang xa » nang x, lang xa, nang ma
de cua » le cua, te cua, dieu cua
cua cu » cua chu, cua cau, cua su

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 thi ((nang xa) or (lang van)) hoi. hieu vien cac xuc van hanh de cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thi ((nang xa) OR (lang van)) hoi. hieu vien cac xuc van hanh de cua cu.
• Adding a wildcard symbol may retrieve word variants: te sach thi ((nang xa) or (lang van)) hoi. hieu vien cac xuc van hanh de cua cu*.