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 lang » va nang, hoa lang
lang va » lang van, hang va, lang ha
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
tu sac » tu sach, tu cac, tu san
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: tu sac ky nang xa hoi. hieu ((hien bach) OR (hien hanh)) tuoc va lang va ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. hieu ((hien bach) OR (hien hanh)) tuoc va lang va ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang xa hoi. hieu ((hien bach) OR (hien hanh)) tuoc va lang va ((cuu tre) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. hieu ((hien bach) OR (hien hanh)) tuoc va lang va ((cuu tre) or (cua tre))*.