Perhaps you should try some spelling variations:
dang xay » dang van, van xay
su triet » su viet, su tien, ve triet
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
cac bac » cac bai, cac ban, cac cach
va dao » ca dao
tu sac » tu sach, tu cac, tu san
va dan » ca dan, va dau, va dap
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky dang xay hoi. hieu va cac bac ((va dan) or (va dao)) hai ((su triet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky dang xay hoi. hieu va cac bac ((va dan) OR (va dao)) hai ((su triet) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky dang xay hoi. hieu va cac bac ((va dan) or (va dao)) hai ((su triet) or (cua vat))*.