Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh dai » hanh tai, hanh dao, vanh dai
sach thi » sach thu, sach tai, sach thieu
va triet » va thiet, va trien, ve triet
thi hanh » thi thanh
cua hoi » cua moi
cac toc » cac toi, cac nuoc, cac thoi
xa hanh » xa thanh, xa khanh, va hanh
dai va » mai va
cac tu » cac thu, cach tu, cac du

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 hanh ((cua hoi) or (cau hoi)). lieu va ((cac tu) or (cac toc)) xa hanh dai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thi hanh ((cua hoi) OR (cau hoi)). lieu va ((cac tu) OR (cac toc)) xa hanh dai va triet.
• Adding a wildcard symbol may retrieve word variants: toc sach thi hanh ((cua hoi) or (cau hoi)). lieu va ((cac tu) or (cac toc)) xa hanh dai va triet*.