Perhaps you should try some spelling variations:
hanh thanh » nhanh thanh, thanh thanh, khanh thanh
thanh dat » thanh san, thanh hai, thanh van
tu sach » thu sach, su sach, te sach
xay hoi » xa hoi, tay hoi, cay phoi
ve chim » va chim, ve cham, ve chinh
va chat » van chat, va phat, cao chat
y dang » ky dang, _ dang, b dang
2 dang » 2 danh, _ dang, b dang
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((y dang) OR (2 dang)) xay hoi. hieu ((ve chim) or (va chat)) thuc hanh thanh dat va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y dang) OR (2 dang)) xay hoi. hieu ((ve chim) OR (va chat)) thuc hanh thanh dat va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y dang) OR (2 dang)) xay hoi. hieu ((ve chim) or (va chat)) thuc hanh thanh dat va thiet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y dang) OR (2 dang)) xay hoi. hieu ((ve chim) or (va chat)) thuc hanh thanh dat va thiet*.