Perhaps you should try some spelling variations:
thieu nien » thien nhien
sach tren » sach tien, sach tranh
tren nano » trien nang, tren nen, tren mang
hoc sach » hoc sinh, hoc cac, hoc anh
nien cap » nien lap, vien cac, vien cao
cap nuoc » dat nuoc
mai doi » moi doi, mai hoi, mai khoi
lai hoi » dai hoi, lai hoa, lai roi
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach tren nano ((mai doi) or (lai hoi)). thieu nien cap nuoc va hanh di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach tren nano ((mai doi) OR (lai hoi)). thieu nien cap nuoc va hanh di cua vat.
• Adding a wildcard symbol may retrieve word variants: hoc sach tren nano ((mai doi) or (lai hoi)). thieu nien cap nuoc va hanh di cua vat*.