Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
thu sach » tu sach, thuat sach, thuoc sach
sang ma » tang ma, nang ma, sang tao
sach ty » sach y, sach tu, sach thu
nam duc » nam duoc, pham duc, nam thuc
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, dua tren

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty ((nang xa) or (sang ma)) hoi. hieu van nam duc va thanh vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang xa) OR (sang ma)) hoi. hieu van nam duc va thanh vi ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang xa) or (sang ma)) hoi. hieu van nam duc va thanh vi ((cua tre) or (cua triet))*.