Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
hieu vien » hieu hien, hieu viec, thieu nien
thanh ve » hanh ve, thanh va, thanh vien
vien cac » vien bach, vien dai, vien da
va triet » va thiet, va trien, ve triet
hoc sach » hoc sinh, hoc cac, hoc anh
ty nang » ky nang, ty xang, ty hang
tac va » tac da, tuc va, tac ha
tac xa » tuc xa, tac da
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: ((thuoc sach) or (hoc sach)) ty nang x hoi. hieu vien cac ((tac va) OR (tac xa)) thanh ve va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (hoc sach)) ty nang x hoi. hieu vien cac ((tac va) OR (tac xa)) thanh ve va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (hoc sach)) ty nang x hoi. hieu vien cac ((tac va) OR (tac xa)) thanh ve va triet".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (hoc sach)) ty nang x hoi. hieu vien cac ((tac va) OR (tac xa)) thanh ve va triet*.