Perhaps you should try some spelling variations:
dang xay » dang van, van xay
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua dieu
song ky » hong ky, dong ky, sang ky
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hanh di » hanh vi, hanh de, hang di
va cau » van cau, va dau, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat song ky dang xay hoi. hieu ((va cau) OR (va cac)) truc van hanh di ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat song ky dang xay hoi. hieu ((va cau) OR (va cac)) truc van hanh di ((cua viet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat song ky dang xay hoi. hieu ((va cau) OR (va cac)) truc van hanh di ((cua viet) or (cua vat))".
• Adding a wildcard symbol may retrieve word variants: thuat song ky dang xay hoi. hieu ((va cau) OR (va cac)) truc van hanh di ((cua viet) or (cua vat))*.