Perhaps you should try some spelling variations:
hien bach » vien bach, thien hach, dien sach
hien hanh » dieu hanh
danh doi » danh di, thanh doi, dung doi
nang xa » nang x, lang xa, nang ma
tuoc va » thuoc va, duoc va, tuc va
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
so sac » so sach, so dac
sac ky » cac ky, sai ky

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

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