Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hanh tinh » nhanh tinh, thanh tinh, canh tinh
tu sach » thu sach, su sach, te sach
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve bao » te bao, va bao
ve co » vo co, va co, de co

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 lang xa hoi. hieu ((ve co) or (ve bao)) duc va ((hanh tinh) OR (hanh trinh)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. hieu ((ve co) OR (ve bao)) duc va ((hanh tinh) OR (hanh trinh)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang xa hoi. hieu ((ve co) or (ve bao)) duc va ((hanh tinh) OR (hanh trinh)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. hieu ((ve co) or (ve bao)) duc va ((hanh tinh) OR (hanh trinh)) cuu tre*.