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
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan, thuc day
dau vai » dau va, dau hai, dau tai
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
va cam » va cham, va cac, va cao
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 hoi. lieu va cam thuc va dau vai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((cach thuc) OR (cach thuce)) nang xa hoi. lieu va cam thuc va dau vai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((cach thuc) or (cach thuce)) nang xa hoi. lieu va cam thuc va dau vai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thu ((cach thuc) or (cach thuce)) nang xa hoi. lieu va cam thuc va dau vai ((cua tre) OR (cuu tre))*.