Perhaps you should try some spelling variations:
duy sang » duy van, duy can, duy anh
hieu van » hieu va, thien van, lieu va
danh lai » danh sai, gianh lai, dinh lam
te sach » toc sach
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
va danh » va dinh, va dan, va hanh
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((duy sang) or (ty xang)) xa hoi. hieu van cam duc va danh lai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((duy sang) OR (ty xang)) xa hoi. hieu van cam duc va danh lai ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((duy sang) or (ty xang)) xa hoi. hieu van cam duc va danh lai ((cua tre) OR (cua te))*".