Perhaps you should try some spelling variations:
dang xay » dang van, van xay
hieu van » thien van, lieu va, hieu ve
thuc dan » thuc hanh, hoc dan, thuc vat
te sach » toc sach
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
tuc van » thuc van, truc van, tuc va
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua
cua tu » cua tuc, cua su, cua cu

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