Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
thanh van » thanh san, thanh toan, thanh nhan
chat tuc » chat xuc, luat tuc, chat huu
nang xay » dang xay, nganh xay, nang xuan
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
huy tri » huu tri, duy tri, huy tran
tuc va » thuc va, truc va, tuc xa

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 nang xay hoi. ((hieu va) OR (lieu va)) chat tuc va ((thanh van) or (thanh phan)) huy tri~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xay hoi. ((hieu va) OR (lieu va)) chat tuc va ((thanh van) OR (thanh phan)) huy tri.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xay hoi. ((hieu va) OR (lieu va)) chat tuc va ((thanh van) or (thanh phan)) huy tri".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xay hoi. ((hieu va) OR (lieu va)) chat tuc va ((thanh van) or (thanh phan)) huy tri*.