Perhaps you should try some spelling variations:
van trieu » tan trieu, van tieu, van hieu
toan hanh » toan thanh, toan anh, tran hanh
vien cac » vien bach, vien dai, vien da
duc toan » duc tan, duc ton, duc hoan
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
x hoi » xa hoi, o hoi, x ho

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 ty nang x hoi. hieu ((va bai) or (vien cac)) duc toan hanh vi van trieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang x hoi. hieu ((va bai) OR (vien cac)) duc toan hanh vi van trieu.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang x hoi. hieu ((va bai) or (vien cac)) duc toan hanh vi van trieu*.