Perhaps you should try some spelling variations:
cach thuce » sach thue
cach thuc » anh thuc, cac thu
cam thuc » am thuc, nam thuc, cam thu
hieu van » hieu va, thien van, lieu va
nang xa » lang xa, nang ma, mang xa
van cam » van nam, van lam, van cau
thuc va » thuc vat, thuc dan, thuc day
dau vai » dau va, dau hai, dau tai
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((cach thuc) or (cach thuce)) ((nang xa) OR (nang x)) hoi. hieu van cam thuc va dau vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((cach thuc) OR (cach thuce)) ((nang xa) OR (nang x)) hoi. hieu van cam thuc va dau vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((cach thuc) or (cach thuce)) ((nang xa) OR (nang x)) hoi. hieu van cam thuc va dau vai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((cach thuc) or (cach thuce)) ((nang xa) OR (nang x)) hoi. hieu van cam thuc va dau vai cua tre*.