Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
toc cach » hoc cach, toc sach, truoc cach
hang doi » hang di, hang loi, huong doi
nang doi » nang doc, nang noi, nang dong
thuc dan » thuc hanh, hoc dan, thuc vat
cuoc tre » cuoc tro, nuoc tren, duoc tren
hieu va » lieu va, hieu qua
tu nong » tu dong, tu cong, tu tong
tu nang » tru nang, tu nano, tu lang
va cach » va cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc cach ((tu nang) OR (tu nong)) xa hoi. hieu va cach thuc dan ((nang doi) or (hang doi)) cuoc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc cach ((tu nang) OR (tu nong)) xa hoi. hieu va cach thuc dan ((nang doi) OR (hang doi)) cuoc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc cach ((tu nang) OR (tu nong)) xa hoi. hieu va cach thuc dan ((nang doi) or (hang doi)) cuoc tre".
• Adding a wildcard symbol may retrieve word variants: toc cach ((tu nang) OR (tu nong)) xa hoi. hieu va cach thuc dan ((nang doi) or (hang doi)) cuoc tre*.