Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
lang van » dang van, tang van, hoang van
van hoi » van hoa, van hoc, van hoe
hieu vu » hieu va, hieu ve, hieu su
vu tham » va tham, vu kham, vu cham
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
sach v » sach va, sach 2, sach vay
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: te ((sach v) OR (sach y)) lang van hoi. hieu vu tham thuc va danh vi cua vat~.
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach y)) lang van hoi. hieu vu tham thuc va danh vi cua vat*.