Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
va trien » va truyen, va thiet, va tuyen
sach thi » sach thu, sach tai, sach thieu
thi hang » thi hanh, thi nang, thi hong
va triet » va thiet, ve triet, cua triet
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
cua hoi » cua moi
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 thi hang ((cua hoi) or (xa hoi)). hieu va am thuc va thanh tai ((va triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi hang ((cua hoi) OR (xa hoi)). hieu va am thuc va thanh tai ((va triet) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: tu sach thi hang ((cua hoi) or (xa hoi)). hieu va am thuc va thanh tai ((va triet) or (va trien))*.