Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » thien van, lieu va
cuu thuc » cuu tac
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va tich » va tinh, va dich
y nang » ky nang, ly nang, v nang
va cua » va chua, via cua, ca cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y nang xa hoi. ((((hieu ve) OR (hieu van))) or (hieu va)) cuu thuc va tich va cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang xa hoi. ((((hieu ve) OR (hieu van))) OR (hieu va)) cuu thuc va tich va cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y nang xa hoi. ((((hieu ve) OR (hieu van))) or (hieu va)) cuu thuc va tich va cua tu".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang xa hoi. ((((hieu ve) OR (hieu van))) or (hieu va)) cuu thuc va tich va cua tu*.