Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
tai cua » thai cua, tai cuc, dai cua
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
hieu ve » hieu van
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
xuc va » duc va, tuc va, luc va
ma hoi » mai hoi, xa hoi, ma hoa

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