Perhaps you should try some spelling variations:
huong doi » huong dan, trong doi, dung doi
va huong » va thuong, va phuong, va tuong
so sach » so sanh, bo sach, co sach
doi cua » dai cua, hoi cua
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
ty nang » ky nang, ty hang, ly nang
cam tu » cam thu, nam tu, tam tu
dam tu » nam tu, tam tu, dam thuc
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((ty nang) or (ty xang)) o hoi. hieu va ((cam tu) or (dam tu)) va huong doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ty nang) OR (ty xang)) o hoi. hieu va ((cam tu) OR (dam tu)) va huong doi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ((ty nang) or (ty xang)) o hoi. hieu va ((cam tu) or (dam tu)) va huong doi cua tre*.