Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cau thuc » cau truc, cuu thuc, can thuc
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
thuc va » thuc vat, thuc dan, thuc day
va tinh » may tinh
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
di cuu » di cua, dinh cuu
di cau » da cau, diem cau

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 xa hoi. hieu van cau thuc va tinh ((di cuu) or (di cau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang xa hoi. hieu van cau thuc va tinh ((di cuu) OR (di cau)) tre*.