Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tham luc » than luc, tham nuoc, tham thuc
danh du » danh dau, danh tu, dinh du
va tham » van tham, va cham, va thanh
cuu tre » cua tre, cau tren, cau treo
va nang » van nang, da nang, cam nang
luc va » duc va, tuc va, loc va
dan du » dan dau, dan su, van du
v nang » vu nang, van nang, voi nang

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 ((v nang) OR (va nang)) xa hoi. lieu va tham luc va ((dan du) or (danh du)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((v nang) OR (va nang)) xa hoi. lieu va tham luc va ((dan du) OR (danh du)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((v nang) OR (va nang)) xa hoi. lieu va tham luc va ((dan du) or (danh du)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((v nang) OR (va nang)) xa hoi. lieu va tham luc va ((dan du) or (danh du)) cuu tre*.