Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
xay hoi » xa hoi, tay hoi, cay phoi
va cam » va cham, va cao, va cai
v dang » vu dang, va dang, 2 dang
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) v dang xay hoi. hieu ((va cam) or (va cac)) duc va tinh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) v dang xay hoi. hieu ((va cam) OR (va cac)) duc va tinh vi cua tu.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) v dang xay hoi. hieu ((va cam) or (va cac)) duc va tinh vi cua tu*.