Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tay lang » tai lang, tay tang, tay quang
hanh vai » hanh vi, hanh va, hanh tai
so sach » so sanh, bo sach, co sach
qua cam » qua cham, qua cac, qua ca
thuc va » thuc vat, thuc dan, thuc day
vai cua » dai cua, hai cua, lai cua
y lang » o lang, _ lang, yen lang

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 (tay lang)) xa hoi. hieu qua cam ((thuc va) or (duc va)) hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((y lang) OR (tay lang)) xa hoi. hieu qua cam ((thuc va) OR (duc va)) hanh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((y lang) OR (tay lang)) xa hoi. hieu qua cam ((thuc va) or (duc va)) hanh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: so sach ((y lang) OR (tay lang)) xa hoi. hieu qua cam ((thuc va) or (duc va)) hanh vai cua triet*.