Perhaps you should try some spelling variations:
hien bach » vien bach, thien hach, dien sach
hien hanh » dieu hanh
sach thu » sach thue, sach thieu, sach tham
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ty) OR (sach thu)) nang xa hoi. hieu ((hien bach) OR (hien hanh)) nuoc va tinh vi cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ty) OR (sach thu)) nang xa hoi. hieu ((hien bach) or (hien hanh)) nuoc va tinh vi cua tu~".
• Adding a wildcard symbol may retrieve word variants: so ((sach ty) OR (sach thu)) nang xa hoi. hieu ((hien bach) or (hien hanh)) nuoc va tinh vi cua tu*.