Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
chat huu » pham huu
chat tuc » chat xuc, luat tuc, chat cua
cau tren » cu tren, dau tren, ca tren
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
nang co » nang doc, nang noi, nang hoc
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
ve cau » ke cau, va cau, ve cac

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 co) OR (nang cao)) hoc. hieu ve ((chat tuc) or (chat huu)) va hanh ve cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang co) OR (nang cao)) hoc. hieu ve ((chat tuc) OR (chat huu)) va hanh ve cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang co) OR (nang cao)) hoc. hieu ve ((chat tuc) or (chat huu)) va hanh ve cau tren".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang co) OR (nang cao)) hoc. hieu ve ((chat tuc) or (chat huu)) va hanh ve cau tren*.