Perhaps you should try some spelling variations:
van chat » cao chat
chat duc » chat xuc, chat doc, chet duoc
su triet » su viet, ve triet
ban banh » ban hanh, ban anh, ban danh
hieu van » hieu va, thien van, lieu va
banh di » danh di, xanh di, banh chi
duc ban » duc tan, duc van, dua ban
te sach » toc sach
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
su tien » su kien, su hien, tu tieng

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) or (su sach)) ky nang xa hoi. hieu van chat duc ban banh di ((su triet) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (su sach)) ky nang xa hoi. hieu van chat duc ban banh di ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (su sach)) ky nang xa hoi. hieu van chat duc ban banh di ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (su sach)) ky nang xa hoi. hieu van chat duc ban banh di ((su triet) OR (su tien))*.