Perhaps you should try some spelling variations:
dan nang » van nang, dai nang, den nang
van hanh » van thanh, ban hanh, van anh
dau nuoc » dat nuoc, dau ngoc, cap nuoc
su bach » vu bach, su sach, huu bach
dao van » do van, dang van
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
da nang » cam nang, kha nang, cao nang
vi cua » vai cua, di 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 bach ((dan nang) OR (da nang)) xa hoi. hieu va ((dau nuoc) or (dao van)) van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su bach ((dan nang) OR (da nang)) xa hoi. hieu va ((dau nuoc) OR (dao van)) van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su bach ((dan nang) OR (da nang)) xa hoi. hieu va ((dau nuoc) or (dao van)) van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su bach ((dan nang) OR (da nang)) xa hoi. hieu va ((dau nuoc) or (dao van)) van hanh vi cua tre*.