Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
cua triet » cua viet, su triet, va triet
hang mat » dang mat, hang vat, hong mat
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham cuu » cap cuu, chat cua
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
mat hoi » mai hoi, sat hoi, mat troi
duc tre » duoc tren, duc tien
cuu va » cuu van, cuu ve

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 ty hang mat hoi. hieu van cham cuu va thanh tai ((duc tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hang mat hoi. hieu van cham cuu va thanh tai ((duc tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty hang mat hoi. hieu van cham cuu va thanh tai ((duc tre) or (cua triet))*.