Perhaps you should try some spelling variations:
duoc tren » nuoc tren, thuoc tren, dung tren
nam thuc » nam thuoc, am thuc, nam thu
tang tai » hang tai, dung tai, sang tao
duc tre » duc tien
va tang » va trang, van tang, ha tang
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
sach da » sach dao, sach dat, sach dau
dai hoi » dai hoc, dai hai, dai moi
lai hoi » lai hoa, lai roi, mai hoi
da nang » cam nang, kha nang, cao nang
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach da nang ((lai hoi) or (dai hoi)). lieu va nam thuc va tang tai ((duc tre) OR (duoc tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach da nang ((lai hoi) OR (dai hoi)). lieu va nam thuc va tang tai ((duc tre) OR (duoc tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach da nang ((lai hoi) or (dai hoi)). lieu va nam thuc va tang tai ((duc tre) OR (duoc tren))*".