Perhaps you should try some spelling variations:
phan chuc » pham chuc, phan khuc, phan thuc
hanh hai » thanh hai, nhanh hai, hang hai
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
chuc va » thuc va, thuc vat
nang ma » tang ma, sang ma, nang cao
hai cua » thai cua, dai cua, hoi cua
hieu ve » hieu va
va hanh » van hanh, va thanh, va danh
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: so sach thu ((nang ma) or (mang may)) hoi. ((hieu ve) OR (hieu van)) phan chuc va hanh hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu ((nang ma) OR (mang may)) hoi. ((hieu ve) OR (hieu van)) phan chuc va hanh hai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach thu ((nang ma) or (mang may)) hoi. ((hieu ve) OR (hieu van)) phan chuc va hanh hai cua tu".
• Adding a wildcard symbol may retrieve word variants: so sach thu ((nang ma) or (mang may)) hoi. ((hieu ve) OR (hieu van)) phan chuc va hanh hai cua tu*.