Perhaps you should try some spelling variations:
thanh than » thanh thanh, thanh thang, thanh toan
cua triet » cua viet, su triet, va triet
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
tang ma » mang may, tang van
sach ty » sach y, sach tu, sach thu
van bao » van ban, van dao
bao duc » dao duc, bao luc, cao duc
nang ma » sang ma, nang cao, mang may
cua tre » cua te, cuu tre, dua tren
su sach » so sach, vu sach

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang ma) OR (tang ma)) hoi. hieu van bao duc va thanh than ((cua tre) OR (cua triet))~.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang ma) or (tang ma)) hoi. hieu van bao duc va thanh than ((cua tre) or (cua triet))*.