Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
va danh » va dinh, va hanh, dia danh
qua cac » cua cac
luu tre » luu tru, cuu tre, luy tre
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
su cac » tu cac, su cao, su can
va dan » ca dan, va dao, va dau
vi luu » vi lua
su xac » pu xac

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

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