Perhaps you should try some spelling variations:
thieu nien » thien nhien
van thanh » ban thanh, van tuan
van hanh » ban hanh, van anh, van ban
nien cac » vien cac, dien cac, bien cac
cac toc » cac toi, cac nuoc, cac thoi
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
vi su » va su, ve su, oi su
ki su » ky su

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

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