Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hien bach » vien bach, thien hach, hien hanh
thuoc va » thuc va, thuoc ma, thuong va
danh dum » danh du, anh duc, danh tu
su sach » so sach, vu sach
dum cua » duy cua, dam cua, dung cua
duoc va » nuoc va, duc va, duoc ma
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
tuoc va » nuoc va, tuc va, quoc va
nang xa » nang x, lang xa, nang ma

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