Perhaps you should try some spelling variations:
cao trung » cao truong, tao trung, bao trung
nuoc sach » nguoi sach, hoc sach, cuoc cach
ban thai » ban than, ban tai, ban thoi
trung va » truong va, trang va, trung ha
tu sach » thu sach, su sach, te sach
ban thi » dan thi, van thi, can thi
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
va cao » va cac, va co, va dao

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 (nuoc sach)) ky lang xa hoi. lieu va cao trung va ((ban thai) OR (ban thi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (nuoc sach)) ky lang xa hoi. lieu va cao trung va ((ban thai) OR (ban thi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (nuoc sach)) ky lang xa hoi. lieu va cao trung va ((ban thai) OR (ban thi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (nuoc sach)) ky lang xa hoi. lieu va cao trung va ((ban thai) OR (ban thi)) cua tre*.