Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty hang, ly nang
danh de » hanh de, dan de, dang de
hieu ve » hieu van
va danh » va dinh, va dan, va hanh
hieu va » lieu va, hieu qua
cam tu » cam thu, nam tu, dam tu
de cua » le cua, te cua, dieu cua
cua te » cua tu

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: tu sach ((ty nang) OR (ty xang)) xa hoi. ((hieu ve) OR (hieu va)) cam tu va danh de cua te~.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty xang)) xa hoi. ((hieu ve) or (hieu va)) cam tu va danh de cua te*.