Perhaps you should try some spelling variations:
hang tai » hang va, dung tai
tai khoa » da khoa, noi khoa
hieu van » thien van, lieu va, hieu ve
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 ty hang tai khoa. ((hieu van) or (hieu va)) giao duc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty hang tai khoa. ((hieu van) OR (hieu va)) giao duc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ty hang tai khoa. ((hieu van) or (hieu va)) giao duc va hanh vi cua tre*.