Perhaps you should try some spelling variations:
bach nuoc » bach tuoc, sach nuoc, bich ngoc
hien bach » vien bach, thien hach, hien hanh
hieu hien » bieu hien, dieu hien, chieu chien
kho tang » cao tang
co sach » cuon sach, hoc sach
ky lang » ky nang, ky dang, ky tang
bo sach » hoc sach
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
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: ((co sach) OR (bo sach)) ((ky lang) or (kho tang)) xa hoi. hieu hien bach nuoc va dan vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co sach) OR (bo sach)) ((ky lang) OR (kho tang)) xa hoi. hieu hien bach nuoc va dan vi cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((co sach) OR (bo sach)) ((ky lang) or (kho tang)) xa hoi. hieu hien bach nuoc va dan vi cua tu*".