Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
vat hanh » vat thanh, va hanh, nhat hanh
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
di cua » dai cua, doi cua, de cua
le cua » ly cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach v nang x hoi. hieu ve cham thuc ((vat hanh) or (van hanh)) ((di cua) or (le cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang x hoi. hieu ve cham thuc ((vat hanh) OR (van hanh)) ((di cua) OR (le cua)) tre.
• Adding a wildcard symbol may retrieve word variants: su sach v nang x hoi. hieu ve cham thuc ((vat hanh) or (van hanh)) ((di cua) or (le cua)) tre*.