Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
tat thanh » tai thanh, ta thanh, tat thang
mai khoi » mai khoa, tai khoa, cac khoi
thuc tat » thuc vat, thuc tap, thuc tai
cam thuc » am thuc, nam thuc, cam thu
cua viet » ca viet, hoa viet, cua vat
hieu ve » hieu va, hieu van
vu dang » su dang, vu quang, cua dang
vu nang » vuc nang, va nang, v nang
vai cua » dai cua, hai cua, lai cua
bo sach » co sach, hoc sach
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ((vu nang) or (vu dang)) mai khoi. hieu ve cam thuc tat thanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ((vu nang) OR (vu dang)) mai khoi. hieu ve cam thuc tat thanh vai cua viet.
• Adding a wildcard symbol may retrieve word variants: bo sach ((vu nang) or (vu dang)) mai khoi. hieu ve cam thuc tat thanh vai cua viet*.