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