Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
hieu van » hieu va, thien van, lieu va
cam thu » nam thu, cac thu, ca thu
cua tuc » cua tu, cua thuoc, luat tuc
cua duc » cua nuoc, cua quoc
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky nang o hai. hieu van ((am thuc) or (cam thu)) gia thanh phan ((cua tuc) or (cua duc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang o hai. hieu van ((am thuc) OR (cam thu)) gia thanh phan ((cua tuc) OR (cua duc)).
• Adding a wildcard symbol may retrieve word variants: vu sac ky nang o hai. hieu van ((am thuc) or (cam thu)) gia thanh phan ((cua tuc) or (cua duc))*.