Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hien bich » phien dich, chien dich, mien dich
co sach » bo sach, cuon sach, hoc sach
ky lang » ky dang, ky tang, tay lang
ngoc va » nuoc va, goc va, ngo va
ngoc ha » ngoc hai, ngoc hoa
danh vi » hanh vi, dinh vi, danh di
vi cua » vai cua, di cua
cua su » qua su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ((ky lang) or (ky nang)) xa hoi. hieu hien bich ((ngoc va) OR (ngoc ha)) danh vi cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ((ky lang) OR (ky nang)) xa hoi. hieu hien bich ((ngoc va) OR (ngoc ha)) danh vi cua su*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ((ky lang) or (ky nang)) xa hoi. hieu hien bich ((ngoc va) OR (ngoc ha)) danh vi cua su*".