Perhaps you should try some spelling variations:
thanh loi » thanh hoa, thanh hai, thanh lap
ban thanh » ban hanh, ban hang
cua triet » cua viet, su triet, va triet
sach thu » sach thue, sach thieu, sach tham
qua pham » quan pham, quy pham, qua cham
vu sach » vu bach, su sach, vu khach
dong ha » dong hoa, dong va, dong hoc
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, dua tren

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach thu ((nang x) or (dong ha)) hoi. hieu qua pham duc ban thanh loi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach thu ((nang x) OR (dong ha)) hoi. hieu qua pham duc ban thanh loi ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: vu sach thu ((nang x) or (dong ha)) hoi. hieu qua pham duc ban thanh loi ((cua tre) or (cua triet))*.