Perhaps you should try some spelling variations:
hien hanh » dieu hanh
hieu hien » bieu hien, dieu hien, chieu chien
su sach » so sach, vu sach
duoc va » nuoc va, duc va, duoc ma
cua tre » cua te, cua triet, dua tren
danh du » danh dau, danh tu, dinh du
cuu tre » cau tren, cau treo
sach ky » sac ky, sach y, sach ty
tuoc va » thuoc va, nuoc va, tuc 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 (duoc va)) danh du ((cua tre) OR (cuu 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 (duoc va)) danh du ((cua tre) OR (cuu 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 (duoc va)) danh du ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu hien hanh ((tuoc va) or (duoc va)) danh du ((cua tre) OR (cuu tre))*.