Perhaps you should try some spelling variations:
thieu nien » thien nhien
nien cac » vien cac, dien cac, bien cac
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
su sach » so sach, vu sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
vai cua » dai cua, hai cua, lai cua
cac vo » cac co, cac vi, cac bo
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 y ((nang xa) OR (lang xa)) hoi. thieu nien cac vo ((van hanh) or (ban hanh)) vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (lang xa)) hoi. thieu nien cac vo ((van hanh) OR (ban hanh)) vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) OR (lang xa)) hoi. thieu nien cac vo ((van hanh) or (ban hanh)) vai cua te".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) OR (lang xa)) hoi. thieu nien cac vo ((van hanh) or (ban hanh)) vai cua te*.