Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
xa khanh » xa thanh, van khanh, dat khanh
khanh vi » hanh vi, khanh v, nhanh vi
sach tu » sach thu, cach tu, sach uu
sach ty » sach y, sach thu, xach tay
nam tuc » nam thuc, nam truc, nam tu
cua tre » cua te, cuu tre, dua tren
ang xa » lang xa, mang xa, dang xay

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 tu) or (sach ty)) ang xa hoi. hieu van nam tuc xa khanh vi ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (sach ty)) ang xa hoi. hieu van nam tuc xa khanh vi ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) or (sach ty)) ang xa hoi. hieu van nam tuc xa khanh vi ((cua tre) OR (cua triet))*".