Perhaps you should try some spelling variations:
doan thi » dan thi, doanh tai, hoang thi
cac tho » cac thoi, cac tro, cac thu
sach tu » sach thu, sach ty, sach uu
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
cach tu » cach thuc
tho va » tho van, tao va, tho ca
dan vi » doan vi, don vi, dan va
ve cac » va cac, vien cac

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 tu) OR (cach tu)) lang xa hoi. hieu ve cac tho va ((dan vi) or (doan thi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (cach tu)) lang xa hoi. hieu ve cac tho va ((dan vi) OR (doan thi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) OR (cach tu)) lang xa hoi. hieu ve cac tho va ((dan vi) or (doan thi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) OR (cach tu)) lang xa hoi. hieu ve cac tho va ((dan vi) or (doan thi)) cua tre*.