Perhaps you should try some spelling variations:
va truyen » hoa truyen, co truyen, di truyen
va trien » va thiet, va tuyen, va tieng
hanh dai » hanh tai, hanh dao, vanh dai
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
so sach » so sanh, bo sach, co sach
cao hoi » cau hoi, co hoi, cao hoc
sach v » sach va, sach y, sach 2
ve cam » ve cham, va cam, ve cai
v nang » va nang, vu nang, van nang
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach v nang cao hoi. hieu ((ve cam) or (ve cac)) thuc va hanh dai ((va trien) or (va truyen))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach v nang cao hoi. hieu ((ve cam) OR (ve cac)) thuc va hanh dai ((va trien) OR (va truyen)).
• Adding a wildcard symbol may retrieve word variants: so sach v nang cao hoi. hieu ((ve cam) or (ve cac)) thuc va hanh dai ((va trien) or (va truyen))*.