Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu viec » nhieu viec, hieu ve, sieu viet
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
cac tru » ca tru, cac tro, cac thu
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
tru va » truc va, tu va, trung va
vi cua » vai cua, di cua
te cua » tue cua, le cua, de 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 sach y nang xa hoi. ((hieu viec) or (thieu nien)) cac tru va hanh ((vi cua) or (te cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. ((hieu viec) OR (thieu nien)) cac tru va hanh ((vi cua) OR (te cua)) triet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. ((hieu viec) or (thieu nien)) cac tru va hanh ((vi cua) or (te cua)) triet*.