Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cham cuu » cap cuu, chat cua
hieu va » hieu qua
va chua » vua chua, ca chua, va chu
y nang » ky nang, ly nang, v nang
cuu ve » cuu va
ve dan » ke dan, le dan, va dan
va cua » via cua, ca cua, ma cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang x hoi. ((hieu va) or (lieu va)) cham cuu ve dan ((va cua) OR (va chua)) vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. ((hieu va) OR (lieu va)) cham cuu ve dan ((va cua) OR (va chua)) vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x hoi. ((hieu va) or (lieu va)) cham cuu ve dan ((va cua) OR (va chua)) vat".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. ((hieu va) or (lieu va)) cham cuu ve dan ((va cua) OR (va chua)) vat*.