Perhaps you should try some spelling variations:
hieu hien » bieu hien, chieu chien, dieu khien
dieu hien » dieu khien, dieu kien, bieu hien
danh doi » danh di, thanh doi, dung doi
duoc va » nuoc va, duc va, duoc ma
doi cua » dai cua, hoi cua
su sach » so sach, vu sach
tuoc va » thuoc va, nuoc va, tuc va
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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