Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
cac thuc » cach thuc, cac thu, can thuc
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
so sach » so sanh, bo sach, co sach
ve cac » va cac, vien cac
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (so sach)) ((ky lang) OR (ky tang)) ha hoi. hieu ve cac thuc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sach)) ((ky lang) OR (ky tang)) ha hoi. hieu ve cac thuc va hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (so sach)) ((ky lang) OR (ky tang)) ha hoi. hieu ve cac thuc va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sach)) ((ky lang) OR (ky tang)) ha hoi. hieu ve cac thuc va hanh dai cua tre*.