Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, mang may
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, xuc ban
cua tuc » cua duc, cua thuoc, luat tuc
ve cac » va cac, vien cac
cua tu » cua su, cua cu, cua te

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky ((nang ma) or (nang cao)) hoi. hieu ve cac xuc van hanh vi ((cua tu) OR (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((nang ma) OR (nang cao)) hoi. hieu ve cac xuc van hanh vi ((cua tu) OR (cua tuc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((nang ma) or (nang cao)) hoi. hieu ve cac xuc van hanh vi ((cua tu) OR (cua tuc))".
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((nang ma) or (nang cao)) hoi. hieu ve cac xuc van hanh vi ((cua tu) OR (cua tuc))*.