Perhaps you should try some spelling variations:
van nhanh » van thanh, van hanh, van khanh
ly quang » le quang, vu quang
hai chau » lai chau, ha chau, hat chau
cam luu » tam luu
hai cau » hai chu, hai hau, hoi cau
luu van » cuu van, luan van, luu hanh
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao

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 nhanh ((hai cau) OR (hai chau)) 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 nhanh ((hai cau) OR (hai chau)) 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 nhanh ((hai cau) OR (hai chau)) triet".
• Adding a wildcard symbol may retrieve word variants: so sach ((ly quang) or (ly hang)) x ho. hieu va cam luu van nhanh ((hai cau) OR (hai chau)) triet*.