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