Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
hanh mai » hanh ma, hanh mau, hanh may
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve tham » va tham, ve cham, vi tham
vai cua » dai cua, hai cua, bai cua
lai cua » dai cua, hai cua, lai chau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thi hanh mai hoi. hieu ve tham thuc van hanh ((vai cua) or (lai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi hanh mai hoi. hieu ve tham thuc van hanh ((vai cua) OR (lai cua)) triet.
• Adding a wildcard symbol may retrieve word variants: tu sach thi hanh mai hoi. hieu ve tham thuc van hanh ((vai cua) or (lai cua)) triet*.