Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
dat tren » dat trong, dua tren
xay hoi » xa hoi, tay hoi, cay phoi
hanh va » hanh vi
ca tren » cau tren, cu tren, la tren
y dang » ky dang, 2 dang, _ dang
va cap » va cac, va dap, va cao
cuu va » cuu van, cuu ve

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 dang xay hoi. lieu va cap cuu va ((hanh va) or (hang va)) ((ca tren) or (dat tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y dang xay hoi. lieu va cap cuu va ((hanh va) OR (hang va)) ((ca tren) OR (dat tren)).
• Adding a wildcard symbol may retrieve word variants: thu sach y dang xay hoi. lieu va cap cuu va ((hanh va) or (hang va)) ((ca tren) or (dat tren))*.