Perhaps you should try some spelling variations:
tai khoa » da khoa
van hanh » van thanh, ban hanh, van anh
noi khoa » ngoai khoa, hoc khoa
phat xuc » chat xuc, phat xuat, phap xu
xuc van » duc van, luc van, vuc van
hieu va » lieu va, hieu qua
lang ha » long ha
dang ha » dong ha, dung ha, tang ha
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: tu ((tai khoa) OR (noi khoa)) ((dang ha) or (lang ha)) hoi. hieu va phat xuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((tai khoa) OR (noi khoa)) ((dang ha) OR (lang ha)) hoi. hieu va phat xuc van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((tai khoa) OR (noi khoa)) ((dang ha) or (lang ha)) hoi. hieu va phat xuc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((tai khoa) OR (noi khoa)) ((dang ha) or (lang ha)) hoi. hieu va phat xuc van hanh vi cua tre*.