Perhaps you should try some spelling variations:
hien bach » vien bach, thien hach, hien hanh
bieu hien » dieu hien, dieu khien, bien phien
dung doi » huong doi, dung tai, dung co
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
duoc va » nuoc va, duc va, duoc ma
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa

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 ma hoi. bieu hien bach ((tuc va) or (duoc va)) dung doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. bieu hien bach ((tuc va) OR (duoc va)) dung doi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoi. bieu hien bach ((tuc va) or (duoc va)) dung doi cua tre*.