Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nang cau » hang cau, nang dau, bang cau
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cao suc » cao su, cao duc
vi cua » vai cua, di cua
cua te » cua tu

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 cau) OR (nang cao)) hoi. hieu ve ((pham duc) or (cao suc)) van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang cau) OR (nang cao)) hoi. hieu ve ((pham duc) OR (cao suc)) van hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang cau) OR (nang cao)) hoi. hieu ve ((pham duc) or (cao suc)) van hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang cau) OR (nang cao)) hoi. hieu ve ((pham duc) or (cao suc)) van hanh vi cua te*.