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
van chat » cao chat
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
ve chim » va chim, ve cham, ve chinh

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