Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
su triet » su viet, su tien, ve triet
danh vai » danh sai, danh va, doanh van
hieu van » hieu va, thien van, lieu va
le quang » vu quang
ly quang » vu quang
van cam » van nam, van lam, van cau
cam hoc » cao hoc, am hoc, cam hoa
va danh » va dinh, va dan, va hanh
su sach » so sach, vu sach
co hoi » co hoc, co loi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ly quang) OR (le quang)) co hoi. hieu van cam hoc va danh vai ((su triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly quang) OR (le quang)) co hoi. hieu van cam hoc va danh vai ((su triet) OR (va trien))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly quang) OR (le quang)) co hoi. hieu van cam hoc va danh vai ((su triet) or (va trien))*".