Perhaps you should try some spelling variations:
hanh thanh » nhanh thanh, thanh thanh, khanh thanh
thanh dat » thanh san, thanh hai, thanh van
dang xay » dang van, van xay
va trien » va truyen, va thiet, va tuyen
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 cham » va chat, va tham
y dang » ky dang, 2 dang, _ dang

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 xay hoi. hieu ((ve chim) or (va cham)) thuc hanh thanh dat va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y dang xay hoi. hieu ((ve chim) OR (va cham)) thuc hanh thanh dat va trien.
• Adding a wildcard symbol may retrieve word variants: tu sach y dang xay hoi. hieu ((ve chim) or (va cham)) thuc hanh thanh dat va trien*.