Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tang hoa » hang hoa, tang ha, tang ho
cam thuc » am thuc, nam thuc, can thuc
cam thu » nam thu, cac thu, ca thu
dinh vi » dinh ve, dinh viet, dinh tri
danh vi » hanh vi, danh di, danh va
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky tang » ky nang, ky dang, kho tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky tang hoa hoi. hieu ve ((cam thuc) OR (cam thu)) dia ((danh vi) or (dinh vi)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky tang hoa hoi. hieu ve ((cam thuc) OR (cam thu)) dia ((danh vi) OR (dinh vi)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky tang hoa hoi. hieu ve ((cam thuc) OR (cam thu)) dia ((danh vi) or (dinh vi)) su triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky tang hoa hoi. hieu ve ((cam thuc) OR (cam thu)) dia ((danh vi) or (dinh vi)) su triet*.