Perhaps you should try some spelling variations:
thanh mai » thanh hai, thanh tai, thanh moi
sang mai » sang ma, sang tai, lang mai
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, tuc xa, duc va

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 mai hoi. hieu ve cam ((tuc va) or (truc va)) thanh mai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang mai hoi. hieu ve cam ((tuc va) OR (truc va)) thanh mai va triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky sang mai hoi. hieu ve cam ((tuc va) or (truc va)) thanh mai va triet*.