Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu vien » hieu hien, hieu viec, thieu nien
va triet » va thiet, va trien, ve triet
vien cac » vien bach, vien dai, vien da
ty hang » ly hang, ty xang, thi hang
hanh ve » hanh vi, hanh va, hanh kem
ty nang » ky nang, ty xang, ly nang
tac va » tac xa, tuc va, tac ha
x hoi » xa hoi, o hoi, x ho
ve va » ve van, te va, ke va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ((ty nang) or (ty hang)) x hoi. hieu vien cac ((tac va) OR (tac da)) hanh ve va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((ty nang) OR (ty hang)) x hoi. hieu vien cac ((tac va) OR (tac da)) hanh ve va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((ty nang) or (ty hang)) x hoi. hieu vien cac ((tac va) OR (tac da)) hanh ve va triet".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((ty nang) or (ty hang)) x hoi. hieu vien cac ((tac va) OR (tac da)) hanh ve va triet*.