Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van chat » cao chat
van cham » van tham, va cham, van pham
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
so sach » so sanh, bo sach, co sach
ma hoi » mai hoi, xa hoi, ma hoa
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang ma hoi. hieu ((van cham) OR (van chat)) xuc ((va hanh) or (va danh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ma hoi. hieu ((van cham) OR (van chat)) xuc ((va hanh) OR (va danh)) vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang ma hoi. hieu ((van cham) OR (van chat)) xuc ((va hanh) or (va danh)) vi su triet".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ma hoi. hieu ((van cham) OR (van chat)) xuc ((va hanh) or (va danh)) vi su triet*.