Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
sach ty » sach y, sach tu, sach thu
ty sang » ty xang, ty hang, duy sang
dai hoi » dai hoc, dai hai, dai moi
danh vi » dinh vi, danh di, danh va
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa

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 ty sang ((ma hoi) or (dai hoi)). lieu va cac nuoc va ((danh vi) or (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty sang ((ma hoi) OR (dai hoi)). lieu va cac nuoc va ((danh vi) OR (hanh vi)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty sang ((ma hoi) or (dai hoi)). lieu va cac nuoc va ((danh vi) or (hanh vi)) cuu tre*.