Perhaps you should try some spelling variations:
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cua tre » cuu tre, cua triet, dua tren
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
nam tuc » nam thuc, nam truc, nam tu
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
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 ky dang xay hoi. hieu van nam tuc ((va danh) OR (va hanh)) va ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang xay hoi. hieu van nam tuc ((va danh) OR (va hanh)) va ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang xay hoi. hieu van nam tuc ((va danh) OR (va hanh)) va ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang xay hoi. hieu van nam tuc ((va danh) OR (va hanh)) va ((cua tre) or (cua te))*.