Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
qua hai » qua hoat
hai tuc » thai tuc, hai cuc, thai thuc
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
tuc va » thuc va, truc va, tuc xa

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 x) or (dang xay)) hoi. hieu qua hai tuc va hanh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang x) OR (dang xay)) hoi. hieu qua hai tuc va hanh va su triet.
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang x) or (dang xay)) hoi. hieu qua hai tuc va hanh va su triet*.