Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van thanh » ban thanh, van tuan
thu sach » tu sach, thuoc sach, thu hoach
thanh ve » hanh ve, thanh va, thanh vien
dau tren » dau tien, dat tren, dau tieng
may hoi » may thoi, tay hoi, mai hoi
hieu va » lieu va, hieu qua
cau vuc » cau luc, cau truc, cau phuc
vuc van » duc van, luc van, thuc van
y mang » cay mang
va cau » van cau, va cac, va dau
ve dau » va dau, ve du, ke dau

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) or (thuat sach)) y mang may hoi. hieu va cau vuc van thanh ve dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) y mang may hoi. hieu va cau vuc van thanh ve dau tren.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuat sach)) y mang may hoi. hieu va cau vuc van thanh ve dau tren*.