Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham truc » cau truc, nham thuc, pham thuc
ly quang » le quang, vu quang
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
tu sach » thu sach, su sach, te sach
hieu su » hieu sau, tieu su, hieu so
tai hai » thi hai, dai hai, tai ha
su cham » su pham, tu cham, vu cham
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ly hang) or (ly quang)) tai hai. hieu su cham truc ((va hanh) OR (va danh)) di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly hang) OR (ly quang)) tai hai. hieu su cham truc ((va hanh) OR (va danh)) di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ly hang) or (ly quang)) tai hai. hieu su cham truc ((va hanh) OR (va danh)) di cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly hang) or (ly quang)) tai hai. hieu su cham truc ((va hanh) OR (va danh)) di cua triet*.