Perhaps you should try some spelling variations:
hien bach » vien bach, thien hach, hien hanh
hieu hien » bieu hien, dieu hien, chieu chien
danh tu » anh tu, doanh thu
duoc va » nuoc va, duc va, duoc ma
tuoc va » thuoc va, nuoc va, tuc va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
tu cua » hu cua, vu 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 ((nang xa) or (lang xa)) hoi. hieu hien bach ((tuoc va) or (duoc va)) danh tu cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (lang xa)) hoi. hieu hien bach ((tuoc va) OR (duoc va)) danh tu cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (lang xa)) hoi. hieu hien bach ((tuoc va) or (duoc va)) danh tu cua tre*.