Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
sach thu » sach thue, sach thieu, sach tham
manh le » thanh le
va manh » van manh, va danh, va hanh
thuc va » thuc vat, thuc dan, thuc day
ve tham » va tham, ve cham, vi tham
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, xach tay
nang ma » tang ma, sang ma, mang may
le cua » ly cua
cua te » cua tu

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: tu ((sach ty) OR (sach thu)) ((nang ma) OR (nang cao)) hoi. hieu ve tham thuc va manh le cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach thu)) ((nang ma) OR (nang cao)) hoi. hieu ve tham thuc va manh le cua te~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thu)) ((nang ma) OR (nang cao)) hoi. hieu ve tham thuc va manh le cua te*.