Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
cua thuoc » nha thuoc, cay thuoc, cua quoc
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
va thanh » gia thanh, ban thanh, va tinh
cua nuoc » cua quoc, cua nguoi, nha nuoc
tu sach » thu sach, su sach, te sach
ly hang » ly quang
ma hoi » mai hoi, xa hoi, ma hoa

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 ((ly hang) or (ty xang)) ma hoi. hieu van pham duc va thanh vai ((cua thuoc) OR (cua nuoc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly hang) OR (ty xang)) ma hoi. hieu van pham duc va thanh vai ((cua thuoc) OR (cua nuoc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ly hang) or (ty xang)) ma hoi. hieu van pham duc va thanh vai ((cua thuoc) OR (cua nuoc))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly hang) or (ty xang)) ma hoi. hieu van pham duc va thanh vai ((cua thuoc) OR (cua nuoc))*.