Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
van doanh » toan doanh, van dong, van thanh
hien cac » thien cac, vien cac, hieu cac
doanh va » doan va, doanh tai, doanh cua
sach kem » hanh kem
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
nang xa » nang x, lang xa, nang ma
cac le » cach le, cac he, mac le
sac ky » cac ky, sai 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 ((sach kem) or (sac ky)) nang xa hoi. hieu hien cac le van doanh va ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach kem) OR (sac ky)) nang xa hoi. hieu hien cac le van doanh va ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach kem) or (sac ky)) nang xa hoi. hieu hien cac le van doanh va ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach kem) or (sac ky)) nang xa hoi. hieu hien cac le van doanh va ((cua tre) OR (cuu tre))*.