Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
sach thi » sach thu, sach tai, sach thieu
hanh vai » hanh vi, hanh tai, hanh van
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
hanh va » hang va, hanh vi
hanh xa » hanh ma, hanh xu, canh xa
hieu ve » hieu van

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thi ((hanh xa) OR (hanh va)) hoi. ((hieu ve) or (hieu va)) am thuc va hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi ((hanh xa) OR (hanh va)) hoi. ((hieu ve) OR (hieu va)) am thuc va hanh vai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi ((hanh xa) OR (hanh va)) hoi. ((hieu ve) or (hieu va)) am thuc va hanh vai cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach thi ((hanh xa) OR (hanh va)) hoi. ((hieu ve) or (hieu va)) am thuc va hanh vai cua viet*.