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
sach thi » sach tai, sach thieu, sach tham
thuc dao » thuc dan, chuc dao, thuc cao
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
hanh xa » hanh va, hanh ma, hanh xu
ve am » va am

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

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