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
y nang » ky nang, ly nang, v nang
cuu ve » cuu va
ve dan » ke dan, le dan, va dan
dan va » doan va, dan ca, ban va
va cua » va chua, via cua, ca 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 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 vat*".