Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh do » thanh de, thanh hoa, thanh loi
sach ky » sac ky, sach y, sach ty
van hoe » van hoc, van hieu, van hien
hieu va » lieu va, hieu qua
hoc ban » hoc bang, hoc dan, hoc bai
am hoc » ad hoc
cua te » cua tu
va am » va lam, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky nang ((van hoa) or (van hoe)). hieu va am hoc ban ((thanh do) OR (thanh pho)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang ((van hoa) OR (van hoe)). hieu va am hoc ban ((thanh do) OR (thanh pho)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang ((van hoa) or (van hoe)). hieu va am hoc ban ((thanh do) OR (thanh pho)) cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ((van hoa) or (van hoe)). hieu va am hoc ban ((thanh do) OR (thanh pho)) cua te*.