Perhaps you should try some spelling variations:
hieu thien » hieu hien, chieu chien, dieu khien
thien hach » thien thanh, hien hanh
hach qua » bach qua, hanh qua, sach quan
nhanh ha » thanh hoa, thanh hai, khanh hoa
thanh ha » thanh hoa, thanh hai, thanh phan
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
qua va » quan va, qua van, vua va
ban ky » dan ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((ban ky) OR (van ky)) lang xa hoi. hieu thien hach qua va ((thanh ha) or (nhanh ha)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((ban ky) OR (van ky)) lang xa hoi. hieu thien hach qua va ((thanh ha) OR (nhanh ha)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((ban ky) OR (van ky)) lang xa hoi. hieu thien hach qua va ((thanh ha) or (nhanh ha)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((ban ky) OR (van ky)) lang xa hoi. hieu thien hach qua va ((thanh ha) or (nhanh ha)) cua tre*.