Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh oai
thanh dat » thanh san, thanh hai, thanh van
su triet » su viet, su tien, ve triet
sang dai » sang tai, lang dai, sang mai
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
ky sang » ky nang, ky dang, ky tang
cam tu » cam thu, nam tu, dam tu
ve cam » ve cham, ve cac, va cam
tu tp » tu tu, tu te

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky sang dai hoi. hieu ve cam tu tp ((thanh dai) or (thanh dat)) ((va triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang dai hoi. hieu ve cam tu tp ((thanh dai) OR (thanh dat)) ((va triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: su sach ky sang dai hoi. hieu ve cam tu tp ((thanh dai) or (thanh dat)) ((va triet) or (su triet))*.