Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh doi » thanh doi, hanh noi, hang doi
su sach » so sach, vu sach
sach le » cach le, sach de, sach lo
le lang » le tang, le dang, le xang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
doi cua » dai cua, hoi cua
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: su sach le lang xa hoi. hieu va cam ((duc va) or (thuc vat)) hanh doi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach le lang xa hoi. hieu va cam ((duc va) OR (thuc vat)) hanh doi cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach le lang xa hoi. hieu va cam ((duc va) or (thuc vat)) hanh doi cua triet*.