Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vu sach » vu bach, su sach, vu khach
lo lang » o lang, so lang, hoa lang
le lang » le tang, le dang, le xang
hieu va » lieu va, hieu qua
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((lo lang) OR (le lang)) xa hoi. hieu va cac ((duc va) or (thuc vat)) hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((lo lang) OR (le lang)) xa hoi. hieu va cac ((duc va) OR (thuc vat)) hanh di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((lo lang) OR (le lang)) xa hoi. hieu va cac ((duc va) or (thuc vat)) hanh di cua triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ((lo lang) OR (le lang)) xa hoi. hieu va cac ((duc va) or (thuc vat)) hanh di cua triet*.