Perhaps you should try some spelling variations:
hien bach » vien bach, thien hach, dien sach
hien hanh » dieu hanh
dang xay » dang van, van xay
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
tuoc va » thuoc va, nuoc va, duoc va
sach ky » sach y, sach ty, sach kem
xay hoi » xa hoi, tay hoi, cay phoi
sac ky » cac ky, sai ky
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) or (sac ky)) dang xay hoi. hieu ((hien bach) OR (hien hanh)) tuoc va danh vi cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co ((sach ky) OR (sac ky)) dang xay hoi. hieu ((hien bach) OR (hien hanh)) tuoc va danh vi cua su*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co ((sach ky) or (sac ky)) dang xay hoi. hieu ((hien bach) OR (hien hanh)) tuoc va danh vi cua su*".