Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang van » dang van, tang van, nong van
lang van » dang van, tang van, hoang van
tan lang » tai lang, ban lang, lan lang
lang phi » lang phu, lang chai, lang ha
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
phi cua » phai cua, chi cua, khi cua

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 ky ((nang van) or (lang van)) hoi. hieu va cac duc tan lang phi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((nang van) OR (lang van)) hoi. hieu va cac duc tan lang phi cua triet.
• Adding a wildcard symbol may retrieve word variants: so sach ky ((nang van) or (lang van)) hoi. hieu va cac duc tan lang phi cua triet*.