Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cham truc » cau truc, nham thuc, pham thuc
cua viet » ca viet, hoa viet, cua vat
ly quang » le quang, vu quang
su cham » su pham, tu cham, vu cham
truc va » thuc va, thuc vat, trung va
tu sach » thu sach, su sach, te sach
thi hai » thi mai, thi hanh
hieu su » hieu sau, tieu su, hieu so
va dan » ca dan, va dao, va dau
dan di » danh di, dan da, dan de

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)) thi hai. hieu su cham truc va dan di ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly hang) OR (ly quang)) thi hai. hieu su cham truc va dan di ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly hang) or (ly quang)) thi hai. hieu su cham truc va dan di ((cua triet) or (cua viet))*.