Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
doc sach » hoc sach, toc sach, nuoc sach
thuc ban » thuoc ban, thuc dan, thu ban
ban hanh » ban hang
van hoi » van hoa, van hoc, van loi
van hoe » van hoa, van hoc, van hieu
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
y lang » o lang, _ lang, tay lang
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach y lang ((van hoi) or (van hoe)). hieu vu cham thuc ban hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach y lang ((van hoi) OR (van hoe)). hieu vu cham thuc ban hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: doc sach y lang ((van hoi) or (van hoe)). hieu vu cham thuc ban hanh vi cua te*.