Perhaps you should try some spelling variations:
nuoc tren » thuoc tren
cach thuc » anh thuc, cac thu
hang doi » hang di, hang loi, huong doi
nang doi » nang doc, nang noi, nang dong
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
tu nano » truc nano
thuc va » thuc vat, thuc dan, thuc day
tu nang » tru nang, tu nong, 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 sach ((tu nang) OR (tu nano)) xa hoi. hieu va cach thuc va ((nang doi) or (hang doi)) nuoc tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((tu nang) OR (tu nano)) xa hoi. hieu va cach thuc va ((nang doi) OR (hang doi)) nuoc tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((tu nang) OR (tu nano)) xa hoi. hieu va cach thuc va ((nang doi) or (hang doi)) nuoc tren".
• Adding a wildcard symbol may retrieve word variants: toc sach ((tu nang) OR (tu nano)) xa hoi. hieu va cach thuc va ((nang doi) or (hang doi)) nuoc tren*.