Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thu sach » thuat sach, thuoc sach, thu hoach
lang dai » lang hai, lang mai, lang chai
tu sach » su sach, te sach, tu cach
dai hoi » dai hoc, dai hai, dai moi
qua cam » qua cham, qua cac, qua ca
xuc van » duc van, luc van, vuc van
vai cua » dai cua, hai cua, bai cua
lai cua » dai cua, hai cua, lai chau
y lang » o lang, _ lang, tay 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)) y lang dai hoi. hieu qua cam xuc van thanh ((vai cua) OR (lai cua)) quoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y lang dai hoi. hieu qua cam xuc van thanh ((vai cua) OR (lai cua)) quoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) y lang dai hoi. hieu qua cam xuc van thanh ((vai cua) OR (lai cua)) quoc".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y lang dai hoi. hieu qua cam xuc van thanh ((vai cua) OR (lai cua)) quoc*.