Perhaps you should try some spelling variations:
ban tinh » ban thanh, quan tinh, ban hanh
dang xay » dang van, van xay
tinh vi » trinh vi, tinh voi, tinh va
cau cua » cau qua, ca cua, cu cua
cam cua » ca cua, nam cua, lam cua
so sach » so sanh, bo sach, co sach
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
te sach » toc sach
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (te sach)) ky dang xay hoi. hieu qua ((cam cua) OR (cau cua)) ban tinh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (te sach)) ky dang xay hoi. hieu qua ((cam cua) OR (cau cua)) ban tinh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (te sach)) ky dang xay hoi. hieu qua ((cam cua) OR (cau cua)) ban tinh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (te sach)) ky dang xay hoi. hieu qua ((cam cua) OR (cau cua)) ban tinh vi cuu tre*.