Perhaps you should try some spelling variations:
dan thanh » dang thanh, danh thanh, ban thanh
thanh dat » thanh san, thanh hai, thanh van
van chat » cao chat
thuc dan » thuc hanh, hoc dan, thuc vat
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty dung » tay dung, ly dung, te dung
dung ha » dung va, dung he, dung khoa
ve chim » va chim, ve cham, ve chinh
ha hoi » hoa hoi, ha noi, xa hoi

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