Perhaps you should try some spelling variations:
cam thuc » nam thuc, cam thu, cay thuc
can thuc » dan thuc, van thuc, cay thuc
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
luu tre » luu tru, cuu tre, luy tre
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang xa hoi. hieu qua ((((cam thuc) OR (can thuc))) or (am thuc)) va hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang xa hoi. hieu qua ((((cam thuc) OR (can thuc))) OR (am thuc)) va hanh vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang xa hoi. hieu qua ((((cam thuc) OR (can thuc))) or (am thuc)) va hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang xa hoi. hieu qua ((((cam thuc) OR (can thuc))) or (am thuc)) va hanh vi luu tre*.