Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cau tren » cu tren, dau tren, ca tren
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 hanh » ban hang
cuu tre » cua tre, cau treo
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
cac xuc » cam xuc, cac nuoc, chat xuc
van hoe » van hoa, van hoc, van hieu
ty lang » tay lang, ty xang, ty hang

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 ty lang van hoe. hieu vien cac xuc ((van hanh) or (ban hanh)) vai ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty lang van hoe. hieu vien cac xuc ((van hanh) OR (ban hanh)) vai ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty lang van hoe. hieu vien cac xuc ((van hanh) or (ban hanh)) vai ((cuu tre) or (cau tren))*.