Perhaps you should try some spelling variations:
danh xay » dang xay, manh xay, anh xay
cac truc » cau truc, cac tru, cac trung
song ky » hong ky, dong ky, tong ky
sang ky » sang kyo, dang ky, tang ky
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
ca viet » va viet, co viet, hoa viet

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