Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hieu thien » hieu hien, chieu chien, dieu khien
dung doi » huong doi, dung tai, dung co
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
tuoc va » thuoc va, nuoc va, tuc va
duoc va » nuoc va, duc va, duoc ma
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

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 thien hach ((tuoc va) or (duoc va)) dung doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu thien hach ((tuoc va) OR (duoc va)) dung doi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu thien hach ((tuoc va) or (duoc va)) dung doi cua tre*.