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