Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thanh vi » thanh va, thanh ve, nhanh vi
sach ky » sac ky, sach y, sach ty
cac dac » cac dan, cac dai, cac bac
su sach » so sach, vu sach
cac tac » cac toc, cac bac, cac tai
hieu ve » hieu va, hieu van
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang x hoi. hieu ve ((cac tac) or (cac dac)) ta ((thanh vi) OR (hanh vi)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu ve ((cac tac) OR (cac dac)) ta ((thanh vi) OR (hanh vi)) su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu ve ((cac tac) or (cac dac)) ta ((thanh vi) OR (hanh vi)) su triet*".