Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
hanh ve » hanh va, hanh kem
cac luc » cau luc, coc luc, cac nuoc
tu sach » thu sach, su sach, te sach
ly nang » ky nang, ly hang, ly vang
ca tren » cau tren, cu tren, la tren
co hoi » co hoc, co loi
y nang » ky nang, v nang, may nang
luc va » duc va, tuc va, loc va

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 ((y nang) OR (ly nang)) co hoi. hieu vien cac luc va ((hanh ve) or (hanh vi)) ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ly nang)) co hoi. hieu vien cac luc va ((hanh ve) OR (hanh vi)) ca tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ly nang)) co hoi. hieu vien cac luc va ((hanh ve) or (hanh vi)) ca tren*".