Perhaps you should try some spelling variations:
thieu nien » thien nhien
van hanh » van thanh, ban hanh, van anh
ban hang » ngan hang
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
vai cua » dai cua, hai cua, lai cua
cac vo » cac co, cac bo, cac ho
cua te » cua tu

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