Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc day » thuc dan, thuc vat
sach thu » sach thue, sach thieu, sach tham
hanh vai » hanh vi, hanh va, hanh tai
day hanh » day nhanh, day thanh, dao hanh
sach thi » sach tai, sach thieu, sach tham
vai cua » dai cua, hai cua, lai cua
hanh xa » hanh va, hanh ma, hanh xu
va am » va lam, va cam

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