Perhaps you should try some spelling variations:
dang xay » dang van, van xay
hieu van » hieu va, thien van, hieu ve
tan hanh » tan thanh, tang hanh, toan hanh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
lam duc » lam duoc, pham duc, nam duoc
vi cau » ve cau, di cau, viet cau
va cau » van cau, va cac, va dau

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 ky dang xay hoi. ((hieu van) or (lieu va)) lam duc tan hanh ((vi cau) OR (va cau)) trieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xay hoi. ((hieu van) OR (lieu va)) lam duc tan hanh ((vi cau) OR (va cau)) trieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xay hoi. ((hieu van) or (lieu va)) lam duc tan hanh ((vi cau) OR (va cau)) trieu".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xay hoi. ((hieu van) or (lieu va)) lam duc tan hanh ((vi cau) OR (va cau)) trieu*.