Perhaps you should try some spelling variations:
hien hanh » dieu hanh
hieu hien » bieu hien, dieu hien, chieu chien
thuoc va » thuc va, thuoc ma, thuong va
danh du » danh dau, danh tu, dinh du
duoc va » nuoc va, duc va, duoc ma
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
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) OR (sach y)) nang xa hoi. hieu hien hanh ((thuoc va) or (duoc va)) danh du cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) nang xa hoi. hieu hien hanh ((thuoc va) OR (duoc va)) danh du cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach y)) nang xa hoi. hieu hien hanh ((thuoc va) or (duoc va)) danh du cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach y)) nang xa hoi. hieu hien hanh ((thuoc va) or (duoc va)) danh du cua tre*.