Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
cua viet » ca viet, hoa viet, cua vat
tang ma » mang may, tang van
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
cau tuc » cau truc, cau tu, cau luc
va hanh » van hanh, va thanh, va danh
nang ma » sang ma, nang cao, mang may
vai cua » dai cua, hai cua, lai cua
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 ma) OR (tang ma))) or (lang xa)) hoi. hieu van cau tuc va hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((((nang ma) OR (tang ma))) OR (lang xa)) hoi. hieu van cau tuc va hanh vai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((((nang ma) OR (tang ma))) or (lang xa)) hoi. hieu van cau tuc va hanh vai cua viet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((((nang ma) OR (tang ma))) or (lang xa)) hoi. hieu van cau tuc va hanh vai cua viet*.