Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thu sach » thuat sach, thuoc sach, thu hoach
hanh vai » hanh vi, hanh va, hanh tai
nam tuc » nam thuc, nam truc, nam tu
cua tre » cua te, cua triet, dua tren
xa hanh » xa thanh, xa khanh, va hanh
tu sach » su sach, te sach, tu cach
cuu tre » cau tren, cau treo
ang xa » lang xa, mang xa, dang xay
ty ang » ty xang, ty hang, ty anh

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