Perhaps you should try some spelling variations:
van trieu » tan trieu, van tieu, van hieu
vien cac » vien bach, vien dai, vien da
tan hanh » tan thanh, tang hanh, toan hanh
te sach » toc sach
ty nang » ty xang, ty hang, ly nang
va cai » va cac, va bai, va dai
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) OR (ky nang)) x hoi. hieu ((va cai) or (vien cac)) duc tan hanh vi van trieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (ky nang)) x hoi. hieu ((va cai) OR (vien cac)) duc tan hanh vi van trieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty nang) OR (ky nang)) x hoi. hieu ((va cai) or (vien cac)) duc tan hanh vi van trieu".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty nang) OR (ky nang)) x hoi. hieu ((va cai) or (vien cac)) duc tan hanh vi van trieu*.