Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
chau tre » chay tren, chau tho, cho tre
chat duc » chat xuc, chat doc, chet duoc
van anh » tuan anh, van minh
tu sach » thu sach, su sach, te sach
ve chat » va chat, van chat
dai hoi » dai hoc, dai hai, dai moi
ky dang » ky nang, ky danh
ky sang » ky nang, ky tang, duy sang
hieu ve » hieu va, hieu van

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 ((ky sang) or (ky dang)) dai hoi. hieu ve chat duc ((van anh) OR (van thanh)) lai chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky sang) OR (ky dang)) dai hoi. hieu ve chat duc ((van anh) OR (van thanh)) lai chau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky sang) or (ky dang)) dai hoi. hieu ve chat duc ((van anh) OR (van thanh)) lai chau tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky sang) or (ky dang)) dai hoi. hieu ve chat duc ((van anh) OR (van thanh)) lai chau tre*.