Perhaps you should try some spelling variations:
bieu hien » dieu hien, dieu khien, bien phien
hien bach » vien bach, thien hach, hien hanh
su sach » so sach, vu sach
ky lang » ky dang, ky tang, tay lang
tuoc va » thuoc va, duoc va, tuc va
danh du » danh dau, danh tu, dinh du
cua tre » cua te, cuu tre, cua triet
du cua » duy cua, dau cua, dum cua

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 lang) OR (ky nang)) xa hoi. bieu hien bach ((tuoc va) or (nuoc va)) danh du cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky lang) OR (ky nang)) xa hoi. bieu hien bach ((tuoc va) OR (nuoc va)) danh du cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky lang) OR (ky nang)) xa hoi. bieu hien bach ((tuoc va) or (nuoc va)) danh du cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky lang) OR (ky nang)) xa hoi. bieu hien bach ((tuoc va) or (nuoc va)) danh du cua tre*.