Perhaps you should try some spelling variations:
hieu hien » dieu hien, chieu chien, dieu khien
bieu hien » dieu hien, dieu khien, bien phien
danh doi » danh di, thanh doi, dung doi
doi cua » dai cua, hoi cua
duoc va » duc va, duoc ma, duong va
su sach » so sach, vu sach
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 (bieu hien)) bach ((nuoc 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 (bieu hien)) bach ((nuoc 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 (bieu hien)) bach ((nuoc 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 (bieu hien)) bach ((nuoc va) or (duoc va)) danh doi cua tre*.