Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
thai tuc » thai thuc, thai thuy, thai hoc
su triet » su viet, su tien, ve triet
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
hai tuc » hai cuc, thai thuc, hai huoc
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi

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 ky ((nang xa) or (dang xay)) hoi. hieu va ((hai tuc) OR (thai tuc)) va hanh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (dang xay)) hoi. hieu va ((hai tuc) OR (thai tuc)) va hanh va su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang xa) or (dang xay)) hoi. hieu va ((hai tuc) OR (thai tuc)) va hanh va su triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) or (dang xay)) hoi. hieu va ((hai tuc) OR (thai tuc)) va hanh va su triet*.