Perhaps you should try some spelling variations:
day nhanh » day thanh, duy nhanh, dac nhan
cua triet » cua viet, su triet, va triet
cam thuc » am thuc, nam thuc, cam thu
day hanh » day thanh, dao hanh, day manh
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, dua tren
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam

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 ve cam thuc ((day hanh) or (day nhanh)) dai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang xa hoi. hieu ve cam thuc ((day hanh) OR (day nhanh)) dai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang xa hoi. hieu ve cam thuc ((day hanh) or (day nhanh)) dai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang xa hoi. hieu ve cam thuc ((day hanh) or (day nhanh)) dai ((cua tre) OR (cua triet))*.