Perhaps you should try some spelling variations:
su sach » so sach, vu sach
ky sang » ky dang, ky tang, duy sang
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
ca viet » va viet, co viet, hoa viet
ma hoi » mai hoi, xa hoi, ma hoa
cam tu » cam thu, nam tu, dam tu
vi ca » vit ca, li ca, va ca

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 xuc) or (cam tu)) va hanh vi ca viet~.
• 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 xuc) OR (cam tu)) va hanh vi ca viet.
• Adding a wildcard symbol may retrieve word variants: su sach ((ky sang) or (ky nang)) ma hoi. hieu va ((cam xuc) or (cam tu)) va hanh vi ca viet*.