Perhaps you should try some spelling variations:
dang xay » dang van, van xay
cam truc » cau truc, nam truc, lam truoc
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
san ky » sang ky, dan ky, ban ky
va cam » va cham, va cac, 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 ((san ky) OR (van ky)) dang xay hoi. hieu va cam truc va hanh di ((hoa viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((san ky) OR (van ky)) dang xay hoi. hieu va cam truc va hanh di ((hoa viet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((san ky) OR (van ky)) dang xay hoi. hieu va cam truc va hanh di ((hoa viet) or (cua vat))".
• Adding a wildcard symbol may retrieve word variants: thuat ((san ky) OR (van ky)) dang xay hoi. hieu va cam truc va hanh di ((hoa viet) or (cua vat))*.