Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
hien bach » vien bach, thien hach, hien hanh
su sach » so sach, vu sach
danh du » danh dau, danh tu, dinh du
nang xa » nang x, lang xa, nang ma
cua tre » cuu tre, cua triet, dua tren
sach ky » sac ky, sach y, sach ty
duoc va » nuoc va, duc va, duoc ma
cua te » cua tu
tuc va » thuc va, truc va, tuc xa

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