Perhaps you should try some spelling variations:
bo sach » co sach, hoc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va kinh » va tinh, qua kinh
vai cua » hai cua, lai cua, bai cua
xuc va » duc va, tuc va, luc va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ty nang xa hoi. ((hieu ve) OR (hieu qua)) cam xuc va kinh ((vai cua) OR (dai cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ty nang xa hoi. ((hieu ve) or (hieu qua)) cam xuc va kinh ((vai cua) OR (dai cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: bo sach ty nang xa hoi. ((hieu ve) or (hieu qua)) cam xuc va kinh ((vai cua) OR (dai cua)) triet*.