Perhaps you should try some spelling variations:
vien cach » vien bach, vien cac, vien canh
hieu vien » hieu hien, hieu viec, thieu nien
ve triet » va trien, su triet
sach tay » xach tay, sach hay, sach tai
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
dang van » hoang van, hang va
sach nay » sach hay, sach vay, sach nang
van hoi » van choi, van hoai, van khoi
cach tu » cach thuc
tu van » tu va
vai ve » va ve, dai ve, vai va

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach tay) OR (sach nay)) dang van hoi. hieu vien cach tu van hanh vai ve triet~.
• Adding a wildcard symbol may retrieve word variants: vu ((sach tay) or (sach nay)) dang van hoi. hieu vien cach tu van hanh vai ve triet*.