Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh tai » thanh tai, hang tai, han tai
dang xay » dang van, van xay
va hanh » van hanh, va thanh, va danh
cac luc » cau luc, coc luc, cac nuoc
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
lang xa » lang ha, lang van
nang xa » nang x, nang ma, mang xa
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 (dang xay))) or (lang xa)) hoi. hieu va cac luc va hanh tai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((((nang xa) OR (dang xay))) OR (lang xa)) hoi. hieu va cac luc va hanh tai su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((((nang xa) or (dang xay))) or (lang xa)) hoi. hieu va cac luc va hanh tai su triet*.