Perhaps you should try some spelling variations:
vua triet » cua triet, va triet, va trien
sach tham » sach nha
sach thu » sach thue, sach thieu, cach thuc
hanh ca » hanh cac, hanh cat, hanh cua
cac tuc » cac tu, cac tac, cac nuoc
cac toc » cac toi, cac nuoc, cac thoi
va hanh » van hanh, va thanh, ban hanh
hanh va » hang va, hanh vi
hieu va » lieu va, hieu qua
ca hoi » cau hoi, cua hoi, xa hoi

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

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