Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
danh dau » lanh dao, hang dau, danh tu
danh sai » dung sai, danh bat, hanh san
sach ky » sac ky, sach y, sach ty
te sach » toc sach
hieu he » hieu ve, hieu le, hieu hien
nang ma » tang ma, sang ma, nang cao
hiem he » hiem xe, thien he, hiem cho
ma hoi » mai hoi, xa hoi, ma hoa

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 nang ma hoi. ((hieu he) OR (hiem he)) nam thu ha ((danh sai) or (danh dau)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. ((hieu he) OR (hiem he)) nam thu ha ((danh sai) OR (danh dau)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoi. ((hieu he) OR (hiem he)) nam thu ha ((danh sai) or (danh dau)) su triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoi. ((hieu he) OR (hiem he)) nam thu ha ((danh sai) or (danh dau)) su triet*.