Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
van thanh » ban thanh, van tuan
cua quoc » cua nuoc, cua thuoc
lang dai » lang hai, lang mai, lang chai
qua cham » qua hai, va cham, qua cua
thu sach » thuat sach, thuoc sach, thu hoach
qua cac » cua cac
dai hoi » dai hoc, dai hai, dai moi
xuc van » duc van, luc van, vuc van
vai cua » dai cua, hai cua, lai cua
tu sach » su sach, te sach, tu cach
o lang » hoa lang, hoi lang

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) or (thu sach)) o lang dai hoi. hieu ((qua cham) OR (qua cac)) xuc van thanh vai cua quoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) o lang dai hoi. hieu ((qua cham) OR (qua cac)) xuc van thanh vai cua quoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) o lang dai hoi. hieu ((qua cham) OR (qua cac)) xuc van thanh vai cua quoc".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) o lang dai hoi. hieu ((qua cham) OR (qua cac)) xuc van thanh vai cua quoc*.