Perhaps you should try some spelling variations:
thieu nien » thien nhien
thu sach » tu sach, thuat sach, thuoc sach
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
cac luc » coc luc, cac nuoc, cac cuoc
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thu sach)) ky nang xa hoi. thieu nien ((cac luc) OR (cau luc)) va hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu sach)) ky nang xa hoi. thieu nien ((cac luc) OR (cau luc)) va hanh vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thu sach)) ky nang xa hoi. thieu nien ((cac luc) OR (cau luc)) va hanh vi cua tu".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu sach)) ky nang xa hoi. thieu nien ((cac luc) OR (cau luc)) va hanh vi cua tu*.