Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » thien van, lieu va
cau thuc » cau truc, cuu thuc, can thuc
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
sach lo » sach dao, sach doi, sach hoi
nang ma » tang ma, sang ma, nang cao
lo nang » ho nang, ly nang, loai nang
ma hoi » mai hoi, xa hoi, ma hoa
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 lo nang ma hoi. ((((hieu ve) or (hieu van))) or (hieu va)) cau thuc va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach lo nang ma hoi. ((((hieu ve) OR (hieu van))) OR (hieu va)) cau thuc va hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: thu sach lo nang ma hoi. ((((hieu ve) or (hieu van))) or (hieu va)) cau thuc va hanh vi cuu tre*.