Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
su sach » so sach, vu sach
lang ha » long ha
va tham » van tham, va cham, va thanh
cua tuc » cua duc, cua tu, cua thuoc
sach v » sach va, sach y, sach 2
v lang » va lang, o lang, _ lang
va cao » va co, va dao, va bao
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v lang ha noi. hieu ((va cac) OR (((va cao) OR (va tham)))) thuc vat hanh vi cua tuc~.
• Adding a wildcard symbol may retrieve word variants: su sach v lang ha noi. hieu ((va cac) or (((va cao) or (va tham)))) thuc vat hanh vi cua tuc*.