Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
so sach » so sanh, bo sach, co sach
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
de cua » le cua, dieu cua
te cua » tue cua, le cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (so sach)) y nang cao hoi. hieu va cam xuc va hanh ((de cua) OR (te cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (so sach)) y nang cao hoi. hieu va cam xuc va hanh ((de cua) OR (te cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (so sach)) y nang cao hoi. hieu va cam xuc va hanh ((de cua) OR (te cua)) triet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (so sach)) y nang cao hoi. hieu va cam xuc va hanh ((de cua) OR (te cua)) triet*.