Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
hieu vien » hieu hien, hieu viec, thieu nien
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
nang xa » nang x, lang xa, nang ma
sach ky » sach y, sach ty, sach kem
vi cua » vai cua, di cua
sac ky » cac ky, sai ky
cua te » cua tu
du va » dau va, tu va, su va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) OR (sac ky)) nang xa hoi. ((hieu vien) or (dieu hien)) cac du va thanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) nang xa hoi. ((hieu vien) OR (dieu hien)) cac du va thanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) nang xa hoi. ((hieu vien) or (dieu hien)) cac du va thanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) nang xa hoi. ((hieu vien) or (dieu hien)) cac du va thanh vi cua te*.