Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
hieu va » lieu va, hieu qua
chuc va » thuc vat
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
vi cuu » vi luu, vinh cuu

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 y nang x ho. ((hieu van) or (hieu va)) cau ((chuc va) OR (thuc va)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x ho. ((hieu van) OR (hieu va)) cau ((chuc va) OR (thuc va)) hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x ho. ((hieu van) or (hieu va)) cau ((chuc va) OR (thuc va)) hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x ho. ((hieu van) or (hieu va)) cau ((chuc va) OR (thuc va)) hanh vi cuu tre*.