Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hang tai » hang va, dung tai
va hang » van hang, va nang, va lang
cam tuc » cam tu, nam thuc, dam thuc
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
ky sang » ky dang, ky tang, duy sang
ma hoi » mai hoi, xa hoi, ma hoa
tai va » thai va, mai va, tri va

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 sang) OR (ky nang)) ma hoi. hieu va ((cam tuc) or (cam xuc)) va hang tai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky sang) OR (ky nang)) ma hoi. hieu va ((cam tuc) OR (cam xuc)) va hang tai va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky sang) OR (ky nang)) ma hoi. hieu va ((cam tuc) or (cam xuc)) va hang tai va triet*".