Perhaps you should try some spelling variations:
dau nuoc » dat nuoc, dau ngoc, cap nuoc
van hanh » van thanh, ban hanh, van anh
cach van » cac van, canh van, cach mang
dao xuan » do xuan, ngo xuan, dao van
bach van » bach dan, bach dang, bach xuan
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
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 van) OR (cach van)) nang xa hoi. hieu va ((dau nuoc) or (dao xuan)) van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((bach van) OR (cach van)) nang xa hoi. hieu va ((dau nuoc) OR (dao xuan)) van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((bach van) OR (cach van)) nang xa hoi. hieu va ((dau nuoc) or (dao xuan)) van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((bach van) OR (cach van)) nang xa hoi. hieu va ((dau nuoc) or (dao xuan)) van hanh vi cua tre*.