Perhaps you should try some spelling variations:
ban hang » ngan hang
su triet » su viet, su tien, ve triet
su sach » so sach
vu sach » vu bach, vu khach
hieu du » hien du, hieu su, hiem du
y nang » ky nang, ly nang, v nang
du cam » tu cam, xu cam, dung cam
x hoi » xa hoi, o hoi, x ho
ve su » va su

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) OR (vu sach)) y nang x hoi. hieu du cam xuc ((van ban) or (ban hang)) ve su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang x hoi. hieu du cam xuc ((van ban) OR (ban hang)) ve su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) y nang x hoi. hieu du cam xuc ((van ban) or (ban hang)) ve su triet*".