Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
toc sach » hoc sach, doc sach, thuoc sach
lang van » dang van, tang van, hoang van
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
van hoi » van hoa, van hoc, van hoe
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
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: toc sach y lang van hoi. hieu va tham thuc ((van hanh) or (ban hanh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y lang van hoi. hieu va tham thuc ((van hanh) OR (ban hanh)) vi cua te.
• Adding a wildcard symbol may retrieve word variants: toc sach y lang van hoi. hieu va tham thuc ((van hanh) or (ban hanh)) vi cua te*.