Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
phan duc » phan tu, phan dau, tran duc
dang xay » dang van, van xay
tu cach » tu cac
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (tu sach)) ky dang xay hoi. hieu ve ((phan duc) OR (pham duc)) va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (tu sach)) ky dang xay hoi. hieu ve ((phan duc) OR (pham duc)) va danh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (tu sach)) ky dang xay hoi. hieu ve ((phan duc) OR (pham duc)) va danh vai cua tre*".