Perhaps you should try some spelling variations:
dan thanh » dang thanh, danh thanh, ban thanh
thanh lai » thanh hai, thanh lap, thanh loi
thuc dan » thuc hanh, hoc dan, thuc vat
va trien » va truyen, va thiet, va tieng
va tuyen » va truyen, tac tuyen, ke tuyen
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va, hieu qua
va am » va lam, va cam

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 hang xa hoi. hieu va am thuc dan thanh lai ((va trien) or (va tuyen))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hang xa hoi. hieu va am thuc dan thanh lai ((va trien) OR (va tuyen)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty hang xa hoi. hieu va am thuc dan thanh lai ((va trien) or (va tuyen))*.