Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
san thanh » ban thanh, van thanh, son thanh
cua triet » cua viet, su triet, va triet
sach doi » sach hoi, sach moi, sach dao
doi nang » dai nang, hoi nang, voi nang
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
van cac » van hac, van cau, van bac
cac bac » cac bai, cac ban, cac cach
bac san » bac son, cac san, bai san
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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 doi nang x hoi. hieu van cac bac san thanh dai ((cua triet) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi nang x hoi. hieu van cac bac san thanh dai ((cua triet) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach doi nang x hoi. hieu van cac bac san thanh dai ((cua triet) or (cua te))*.