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 dau » lanh dao, hang dau, danh tu
su sach » so sach, vu sach
dau cua » dai cua, day cua, cau 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
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang

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