Perhaps you should try some spelling variations:
thanh do » thanh de, thanh pho, thanh hoa
sang mai » sang ma, sang tai, lang mai
thanh di » thanh doi, thanh de, thanh dinh
thuc va » thuc vat, thuc dan, thuc day
ca viet » va viet, co viet, hoa viet
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
le nam » he nam, le na, te nam
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky sang mai hoi. hieu ((le nam) or (ly nam)) thuc va ((thanh di) OR (thanh do)) ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky sang mai hoi. hieu ((le nam) OR (ly nam)) thuc va ((thanh di) OR (thanh do)) ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky sang mai hoi. hieu ((le nam) or (ly nam)) thuc va ((thanh di) OR (thanh do)) ca viet".
• Adding a wildcard symbol may retrieve word variants: su sac ky sang mai hoi. hieu ((le nam) or (ly nam)) thuc va ((thanh di) OR (thanh do)) ca viet*.