Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
su triet » su viet, ve triet
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
vien cac » vien bach, vien da, gian cac
vien dai » hien dai
sach ty » sach y, sach tu, sach thu
ty tang » tay tang, ty xang, ty hang
su tien » su kien, su hien, tu tieng
tac va » tac da, tac xa, tuc va
tang o » trang o, lang o
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty tang o hoi. hieu ((vien cac) or (vien dai)) tac va thanh vi ((su triet) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty tang o hoi. hieu ((vien cac) OR (vien dai)) tac va thanh vi ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty tang o hoi. hieu ((vien cac) or (vien dai)) tac va thanh vi ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: thu sach ty tang o hoi. hieu ((vien cac) or (vien dai)) tac va thanh vi ((su triet) OR (su tien))*.