Perhaps you should try some spelling variations:
bieu hien » dieu hien, bien phien, bien nien
danh du » danh dau, danh tu, dinh du
tuoc va » thuoc va, duoc va, tuc va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
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 xa hoi. ((bieu hien) OR (dieu khien)) 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 xa hoi. ((bieu hien) OR (dieu khien)) 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 xa hoi. ((bieu hien) OR (dieu khien)) bach ((tuoc va) or (nuoc va)) danh du cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. ((bieu hien) OR (dieu khien)) bach ((tuoc va) or (nuoc va)) danh du cua tre*.