Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nham thu, pham thuc
day thanh » dao thanh, dat thanh, da thanh
toc sach » hoc sach, doc sach, thuoc sach
thanh vi » hanh vi, thanh va, thanh ve
nam thuc » nam thuoc, am thuc, nam thu
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, mang may
cuu tre » cua tre, cau tren, cau treo
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: toc sach y ((nang ma) or (nang cao)) hoi. hieu ve ((nham thuc) OR (nam thuc)) day thanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((nang ma) OR (nang cao)) hoi. hieu ve ((nham thuc) OR (nam thuc)) day thanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y ((nang ma) or (nang cao)) hoi. hieu ve ((nham thuc) OR (nam thuc)) day thanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc sach y ((nang ma) or (nang cao)) hoi. hieu ve ((nham thuc) OR (nam thuc)) day thanh vi cuu tre*.