Perhaps you should try some spelling variations:
sach thi » sach tai, sach thieu, sach tham
sach thu » sach thue, sach thieu, sach tham
hanh vai » hanh vi, hanh va, hanh tai
ve triet » va trien, su triet
hanh xa » hanh va, hanh ma, hanh xu
cac tuc » cac tu, cac tac, cac nuoc
cac toc » cac toi, cac nuoc, cac thoi
va hanh » van hanh, va thanh, ban hanh
vai ve » va ve, dai ve, vai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach thi) or (sach thu)) hanh xa hoi. lieu va ((cac tuc) or (cac toc)) va hanh vai ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach thi) OR (sach thu)) hanh xa hoi. lieu va ((cac tuc) OR (cac toc)) va hanh vai ve triet.
• Adding a wildcard symbol may retrieve word variants: toc ((sach thi) or (sach thu)) hanh xa hoi. lieu va ((cac tuc) or (cac toc)) va hanh vai ve triet*.