Perhaps you should try some spelling variations:
thanh nghia » thanh nghi, thanh nga, thanh nha
nghia cua » nghiep cua, nghia xa, nghia duy
cam thuc » nam thuc, cam thu, can thuc
vu khach » vu khanh, vu khac, vay khach
da thanh » dao thanh, dat thanh, dam thanh
vu sach » vu bach, su sach
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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: ((vu sach) OR (vu khach)) ty nang o hoi. hieu ve ((cam thuc) OR (am thuc)) da thanh nghia cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (vu khach)) ty nang o hoi. hieu ve ((cam thuc) OR (am thuc)) da thanh nghia cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu khach)) ty nang o hoi. hieu ve ((cam thuc) OR (am thuc)) da thanh nghia cua tre*.