Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
nam thuc » nam thuoc, am thuc, nam thu
cham tuc » nham thuc, pham thuc, tham thuc
su triet » su viet, su tien, ve triet
dang xay » dang van, van xay
hieu va » lieu va, hieu qua
sach ki » sach kinh, sach bai, sach kem
lang xa » lang ha, lang van
va hanh » van hanh, va thanh, va danh
vai su » va su, van su, 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 ki ((lang xa) OR (dang xay)) hoi. hieu va ((cham tuc) or (nam thuc)) va hanh vai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ki ((lang xa) OR (dang xay)) hoi. hieu va ((cham tuc) OR (nam thuc)) va hanh vai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ki ((lang xa) OR (dang xay)) hoi. hieu va ((cham tuc) or (nam thuc)) va hanh vai su triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ki ((lang xa) OR (dang xay)) hoi. hieu va ((cham tuc) or (nam thuc)) va hanh vai su triet*.