Perhaps you should try some spelling variations:
dang van » hoang van, hang va
sach ky » sach y, sach ty, sach kem
danh va » doanh va, hanh va, anh va
cac toc » cac toi, cac nuoc, cac thoi
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
toc xa » tuc xa, toc ta, hoc xa
sac ky » cac ky, sai ky
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: toc ((sach ky) OR (sac ky)) nang xa hoi. hieu ve cac toc xa ((dang van) or (danh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sac ky)) nang xa hoi. hieu ve cac toc xa ((dang van) OR (danh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ky) OR (sac ky)) nang xa hoi. hieu ve cac toc xa ((dang van) or (danh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) OR (sac ky)) nang xa hoi. hieu ve cac toc xa ((dang van) or (danh va)) cua tre*.