Perhaps you should try some spelling variations:
thieu nien » thien nhien
van thanh » ban thanh, van tuan
su triet » su viet, su tien, ve triet
van hanh » ban hanh, van anh, van ban
nien cac » vien cac, dien cac, bien cac
sach tu » sach thu, cach tu, sach ty
cac toc » cac toi, cac nuoc, cac thoi
nang xa » lang xa, nang ma, mang xa
su sach » so sach, vu sach
vi su » va su, ve su, ki su

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