Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc day » thuc dan, thuc vat
hanh vai » hanh vi, hanh va, hanh tai
thi hanh » thi thanh
day hanh » day nhanh, day thanh, dao hanh
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, te sach, tu cach
hanh xa » hanh va, hanh ma, hanh xu
su sach » so sach, vu sach
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) OR (su sach)) thi 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) OR (su sach)) thi 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) OR (su sach)) thi 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) OR (su sach)) thi hanh xa hoi. hieu ((ve am) or (va am)) thuc day hanh vai cua triet*.