Perhaps you should try some spelling variations:
thuat cao » thuat co, thuat bao, thuat cam
tham thuc » nham thuc, pham thuc, tam thuc
va thanh » gia thanh, ban thanh, va tinh
va triet » va thiet, va trien, ve triet
hieu va » lieu va, hieu qua
va hanh » van hanh, va danh, ban hanh
mang xa » lang xa, mang may, dang xay
va tham » van tham, va cham, va thuat

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat cao ky ((mang xa) or (nang x)) hoi. hieu va tham thuc ((va hanh) OR (va thanh)) tu va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat cao ky ((mang xa) OR (nang x)) hoi. hieu va tham thuc ((va hanh) OR (va thanh)) tu va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat cao ky ((mang xa) or (nang x)) hoi. hieu va tham thuc ((va hanh) OR (va thanh)) tu va triet".
• Adding a wildcard symbol may retrieve word variants: thuat cao ky ((mang xa) or (nang x)) hoi. hieu va tham thuc ((va hanh) OR (va thanh)) tu va triet*.