Perhaps you should try some spelling variations:
sieu viet » su viet, dien viet, bien viet
viet cac » vien cac, viet ca, viet bac
sach bai » sach dao, cac bai, sach xa
van sach » ban sach, van hach, ngan sach
cuu tre » cau tren, cau treo
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
cac lo » cac lop, cac co, cac bo
lo van » le van, vo van, so van
x hoi » xa hoi, o hoi, x ho

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 (su sach)) ky nang x hoi. sieu viet cac lo van sach bai ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x hoi. sieu viet cac lo van sach bai ((cuu tre) OR (cua tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang x hoi. sieu viet cac lo van sach bai ((cuu tre) OR (cua tre))*".