Perhaps you should try some spelling variations:
hien hanh » dieu hanh
hieu hien » bieu hien, dieu hien, chieu chien
danh dung » dan dung, anh dung, dinh dung
dung cua » dung luan, dung cho
duoc va » nuoc va, duc va, duoc ma
tuoc va » thuoc va, nuoc va, tuc va
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
mang xa » lang xa, mang may, dang xay
sac ky » cac ky, sai ky
su sac » su sach, su cac, su xac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((mang xa) or (nang ma)) hoi. hieu hien hanh ((tuoc va) or (duoc va)) danh dung cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((mang xa) OR (nang ma)) hoi. hieu hien hanh ((tuoc va) OR (duoc va)) danh dung cua tre.
• Adding a wildcard symbol may retrieve word variants: su sac ky ((mang xa) or (nang ma)) hoi. hieu hien hanh ((tuoc va) or (duoc va)) danh dung cua tre*.