Perhaps you should try some spelling variations:
hieu vien » hieu hien, thieu nien, hieu tieng
hieu viec » nhieu viec, hieu ve, sieu viet
lang van » dang van, tang van, hoang van
te sach » toc sach
van anh » van thanh, tuan anh, van minh
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
sang ma » tang ma, nang ma, sang tao
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di cua

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 ((sang ma) or (lang van)) hoi. ((hieu vien) OR (hieu viec)) cac xuc van anh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((sang ma) OR (lang van)) hoi. ((hieu vien) OR (hieu viec)) cac xuc van anh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((sang ma) or (lang van)) hoi. ((hieu vien) OR (hieu viec)) cac xuc van anh vi cua tre*".