Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hang doi » hang di, hang loi, huong doi
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
hang vi » hang va, hanh vi, hang di
y lang » o lang, tay lang, yen lang
_ lang » o lang, _ land
cac tu » cac thu, cach tu, cac du
tu van » tu va

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 ((y lang) OR (_ lang)) xa hoi. hieu va cac tu van ((hang doi) or (hang vi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((y lang) OR (_ lang)) xa hoi. hieu va cac tu van ((hang doi) OR (hang vi)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((y lang) OR (_ lang)) xa hoi. hieu va cac tu van ((hang doi) or (hang vi)) cua triet*".