Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
dau nuoc » dat nuoc, dau ngoc, cap nuoc
van hanh » ban hanh, van anh, van ban
te sach » toc 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

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

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