Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
bach nuoc » bach tuoc, sach nuoc, bich ngoc
dieu kien » dieu khien, dien bien
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
nang xa » nang x, lang xa, nang ma
sach ty » sach tu, sach thu, xach tay
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach ty) OR (sach y)) nang xa hoi. ((hieu hien) or (dieu kien)) bach nuoc va dinh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ty) OR (sach y)) nang xa hoi. ((hieu hien) OR (dieu kien)) bach nuoc va dinh vi cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ty) OR (sach y)) nang xa hoi. ((hieu hien) or (dieu kien)) bach nuoc va dinh vi cua tu*".