Perhaps you should try some spelling variations:
nang noi » nang doc
noi khoa » ngoai khoa, hoc khoa, tai khoa
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
te sach » toc sach
cua tre » cua te, cua triet, dua tren
dua ban » dia ban, cua ban, qua ban
cuu tre » cau tren, cau treo
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
ve cam » ve cham, ve cac, va cam
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang noi khoa. hieu ((ve cam) or (va cao)) dua ban hanh vai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang noi khoa. hieu ((ve cam) OR (va cao)) dua ban hanh vai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: te sach ty nang noi khoa. hieu ((ve cam) or (va cao)) dua ban hanh vai ((cua tre) or (cuu tre))*.