Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
thuc dan » thuc hanh, thuc vat
su triet » su viet, su tien, ve triet
lang hoa » hang hoa, lang ha, nang hoa
sach ky » sac ky, sach y, sach ty
hoa doi » hoa dai, hoc doi, xoa doi
ky lang » ky nang, ky dang, ky tang
ve nam » he nam, va nam, te nam
vai su » va su, van su, lai su
le nam » ly nam, he nam, le na

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 lang hoa doi. hieu ((ve nam) or (le nam)) ((thuc dan) OR (hoc dan)) hanh vai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky lang hoa doi. hieu ((ve nam) OR (le nam)) ((thuc dan) OR (hoc dan)) hanh vai su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky lang hoa doi. hieu ((ve nam) or (le nam)) ((thuc dan) OR (hoc dan)) hanh vai su triet*".