Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, thanh hai, nhanh ha
cau triet » cau trieu, su triet, cua triet
ly quang » le quang, vu quang
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
luu van » cuu van, luu hanh
hai cau » hai chau, hai chu, hai hau
va cam » va cham, va cac, va cao
luan » quan, lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((ly quang) or (ly hang)) x ho. hieu va cam ((luu van) OR (luan van)) nhanh hai cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ly quang) OR (ly hang)) x ho. hieu va cam ((luu van) OR (luan van)) nhanh hai cau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ly quang) or (ly hang)) x ho. hieu va cam ((luu van) OR (luan van)) nhanh hai cau triet".
• Adding a wildcard symbol may retrieve word variants: so sach ((ly quang) or (ly hang)) x ho. hieu va cam ((luu van) OR (luan van)) nhanh hai cau triet*.