Perhaps you should try some spelling variations:
thien van » thi van
hanh tai » thanh tai, hang tai, han tai
than luc » nhan luc, than duc, thanh luu
van than » van thanh, van thang, van tuan
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
nang xa » nang ma, mang xa, ang xa
su viet » so viet
luc va » duc va, tuc va, loc va
tai su » tai so, tai tu, lai su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((((nang xa) or (nang x))) or (lang xa)) hoi. thien van than luc va hanh tai su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((((nang xa) OR (nang x))) OR (lang xa)) hoi. thien van than luc va hanh tai su viet.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((((nang xa) or (nang x))) or (lang xa)) hoi. thien van than luc va hanh tai su viet*.