Perhaps you should try some spelling variations:
hien bach » vien bach, thien hach, hien hanh
hieu hien » bieu hien, dieu hien, chieu chien
su sach » so sach, vu sach
truc va » thuc va, thuc vat, trung va
danh du » danh dau, danh tu, dinh du
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 » thuoc va, nuoc va, tuc va
nang o » nang co, nang ho, nang ro
du cua » duy cua, dau cua, dum cua
o hoi » co hoi, o hoc, o hai

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 o hoi. hieu hien bach ((((tuoc va) or (truc va))) or (duoc va)) danh du cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang o hoi. hieu hien bach ((((tuoc va) OR (truc va))) OR (duoc va)) danh du cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang o hoi. hieu hien bach ((((tuoc va) or (truc va))) or (duoc va)) danh du cua tre*.