Perhaps you should try some spelling variations:
thieu nien » thien nhien
cua viet » ca viet, hoa viet, cua vat
nien cac » vien cac, dien cac, bien cac
dan vai » dan tai, dan vat, den vai
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, su sach, vu khach
cac bao » cach bao, cac bai, cac ban
bao va » bao ve, tao va, ban va
dan va » doan va, dan ca, ban va

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 (vu sach)) ky nang xa hoi. thieu nien cac bao va ((dan vai) OR (dan va)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ky nang xa hoi. thieu nien cac bao va ((dan vai) OR (dan va)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (vu sach)) ky nang xa hoi. thieu nien cac bao va ((dan vai) OR (dan va)) cua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky nang xa hoi. thieu nien cac bao va ((dan vai) OR (dan va)) cua viet*.