Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu vien » hieu hien, hieu viec, hieu tieng
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
cao duc » dao duc, cao suc, giao duc
cua tre » cua te, cuu tre, cua triet
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: ((tu sach) or (thu sach)) ky nang xa hoi. ((hieu vien) OR (thieu nien)) cao duc va danh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang xa hoi. ((hieu vien) OR (thieu nien)) cao duc va danh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang xa hoi. ((hieu vien) OR (thieu nien)) cao duc va danh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang xa hoi. ((hieu vien) OR (thieu nien)) cao duc va danh vi cua tre*.