Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
van hanh » van thanh, van anh, van ban
lang van » dang van, tang van, hoang van
vien cac » vien bach, vien dai, vien da
ban hang » ngan hang
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
cac xuc » cam xuc, cac nuoc, chat xuc
sach ky » sac ky, sach y, sach ty
van hoi » van hoa, van hoc, van hoe
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky lang van hoi. hieu vien cac xuc ((van hanh) or (((ban hanh) or (ban hang)))) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang van hoi. hieu vien cac xuc ((van hanh) OR (((ban hanh) OR (ban hang)))) vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang van hoi. hieu vien cac xuc ((van hanh) or (((ban hanh) or (ban hang)))) vai cua tre*.