Perhaps you should try some spelling variations:
dam thuc » am thuc, dan thuc, nam thuc
dong doi » duong doi, dung doi, dong hoi
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
xa dong » ha dong, van dong, lao dong
doi cuu » doi cua, doi cuoc
cuu tre » cua tre, cau tren, cau treo
cam tu » cam thu, nam tu, dam tu

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 (co sach)) ky nang xa hoi. hieu ve ((dam thuc) or (cam tu)) xa dong doi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ky nang xa hoi. hieu ve ((dam thuc) OR (cam tu)) xa dong doi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ky nang xa hoi. hieu ve ((dam thuc) or (cam tu)) xa dong doi cuu tre*.