Perhaps you should try some spelling variations:
lang hoa » hang hoa, nang hoa, hoang hoa
su triet » su tien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
vat hanh » vat thanh, van hanh, va hanh
tu sach » thu sach, su sach, te sach
thu vat » thuc vat, thu va, thuat vat
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
lang ha » long ha
su viet » so viet
ve nam » he nam, va nam, le nam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((lang hoa) OR (lang ha)) hoi. hieu ve nam thu vat hanh vai ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang hoa) OR (lang ha)) hoi. hieu ve nam thu vat hanh vai ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((lang hoa) OR (lang ha)) hoi. hieu ve nam thu vat hanh vai ((su triet) or (su viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang hoa) OR (lang ha)) hoi. hieu ve nam thu vat hanh vai ((su triet) or (su viet))*.