Perhaps you should try some spelling variations:
cau triet » cau trieu, cua triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
hanh lai » hanh lam, hanh tai, thanh lap
phan day » phan dau, phap day, phan xay
su triet » su viet, su tien, ve triet
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va thanh, va danh
dai hoi » dai hai, dai moi
ve phan » va phan, ke phan, ve phat

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 xang ((dai hoi) OR (dai hoc)). hieu ve phan day va hanh lai ((cau triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty xang ((dai hoi) OR (dai hoc)). hieu ve phan day va hanh lai ((cau triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty xang ((dai hoi) OR (dai hoc)). hieu ve phan day va hanh lai ((cau triet) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ty xang ((dai hoi) OR (dai hoc)). hieu ve phan day va hanh lai ((cau triet) or (su triet))*.