Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
te sach » toc sach
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
hac duc » hoc duc, ha duc, thach duc
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cua tuc » cua duc, cua tu, cua thuoc
va hac » van hac, va khac, va cac
di cua » dai cua, doi cua, de 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 thu ((nang ma) OR (tang ma)) hoi. hieu va hac duc va hanh di cua tuc~.
• Adding a wildcard symbol may retrieve word variants: te sach thu ((nang ma) or (tang ma)) hoi. hieu va hac duc va hanh di cua tuc*.