Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
sach thue » sach thieu, sach tham, cach thuc
sach thu » sach thieu, sach tham, cach thuc
vai cuu » vai cua
ve chat » va chat, van chat
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
co hoi » co hoc, co loi
do van » dao van, vo van, so van
do va » so va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach thu) or (sach thue)) nang co hoi. hieu ve chat ((do va) OR (do van)) thanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach thu) OR (sach thue)) nang co hoi. hieu ve chat ((do va) OR (do van)) thanh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach thu) or (sach thue)) nang co hoi. hieu ve chat ((do va) OR (do van)) thanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach thu) or (sach thue)) nang co hoi. hieu ve chat ((do va) OR (do van)) thanh vai cuu tre*.