Perhaps you should try some spelling variations:
hien bach » vien bach, thien hach, hien hanh
hieu hien » bieu hien, dieu hien, chieu chien
danh lien » danh kien, danh dien, doanh tien
lien cuc » dien cuc, lien tuc, vien cac
su sach » so sach, vu sach
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
duoc va » nuoc va, duoc ma, duong va
cuc tre » duc tre, cua tre, cuu tre

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