Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
su sach » vu sach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
so sach » so sanh, bo sach, co sach
ha hoi » hoa hoi, ha noi, xa hoi
di cua » dai cua, doi cua, de cua
ve cac » va cac

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) or (so sach)) ky lang ha hoi. hieu ((ve cac) or (vien cac)) thuc va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky lang ha hoi. hieu ((ve cac) OR (vien cac)) thuc va hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky lang ha hoi. hieu ((ve cac) or (vien cac)) thuc va hanh di cua tre*.