Perhaps you should try some spelling variations:
hien bach » vien bach, thien hach, dien sach
hien hanh » dieu hanh
nang xa » nang x, lang xa, nang ma
tuoc va » thuoc va, nuoc va, duoc va
va danh » va dinh, va dan, va hanh
dau cua » dai cua, day cua, cau cua
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky
du cua » duy cua, dum cua, hu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky nang xa hoi. bieu ((hien bach) OR (hien hanh)) tuoc va danh ((du cua) or (dau cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky nang xa hoi. bieu ((hien bach) OR (hien hanh)) tuoc va danh ((du cua) OR (dau cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky nang xa hoi. bieu ((hien bach) OR (hien hanh)) tuoc va danh ((du cua) or (dau cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su xac ky nang xa hoi. bieu ((hien bach) OR (hien hanh)) tuoc va danh ((du cua) or (dau cua)) triet*.