Perhaps you should try some spelling variations:
thieu nien » thien nhien
nien cam » nien giam, trien cam, vien cac
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
cam tuc » cam xuc, cam tu, nam thuc
va hanh » va thanh, va danh, ban hanh
lai cua » hai cua, lai chau, thai cua
y nang » ky nang, ly nang, v nang

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 y nang xa hoi. thieu nien cam tuc ((va hanh) OR (van hanh)) ((lai cua) or (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. thieu nien cam tuc ((va hanh) OR (van hanh)) ((lai cua) OR (dai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. thieu nien cam tuc ((va hanh) OR (van hanh)) ((lai cua) or (dai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. thieu nien cam tuc ((va hanh) OR (van hanh)) ((lai cua) or (dai cua)) triet*.