Perhaps you should try some spelling variations:
dau nuoc » dat nuoc, dau ngoc, cap nuoc
nuoc van » nuoc va, nuoc san, luoc van
van hanh » van thanh, ban hanh, van anh
so sach » so sanh, co sach, hoc sach
bo sach » co sach, hoc sach
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
va dau » va dao
vi cua » vai cua
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) OR (bo sach)) y nang x hoi. hieu va dau nuoc van hanh ((vi cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) y nang x hoi. hieu va dau nuoc van hanh ((vi cua) OR (di cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (bo sach)) y nang x hoi. hieu va dau nuoc van hanh ((vi cua) or (di cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (bo sach)) y nang x hoi. hieu va dau nuoc van hanh ((vi cua) or (di cua)) tre*.