Perhaps you should try some spelling variations:
dam thuc » am thuc, dan thuc, nam thuc
dung doi » huong doi, dung tai, dung co
su sach » vu sach
doi cua » dai cua, hoi cua
so sach » so sanh, bo sach, co sach
xa dung » xay dung, xa dong, va dung
hieu ve » hieu va, hieu van
cam tu » cam thu, nam tu, dam tu
nang o » nang co, nang ho, nang ro
cua te » cua tu
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: ((su sach) or (so sach)) ky nang o hoi. hieu ve ((dam thuc) or (cam tu)) xa dung doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang o hoi. hieu ve ((dam thuc) OR (cam tu)) xa dung doi cua te.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky nang o hoi. hieu ve ((dam thuc) or (cam tu)) xa dung doi cua te*.