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

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