Perhaps you should try some spelling variations:
tai khoa » noi khoa
chat luc » chat xuc, chat lua, nhan luc
van hanh » van thanh, ban hanh, van anh
tang ha » lang ha, tang ma, trung ha
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
luc van » luoc van, luu van, duc van
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
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 (da khoa)) tang ha hoi. hieu va chat luc van hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((tai khoa) OR (da khoa)) tang ha hoi. hieu va chat luc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((tai khoa) OR (da khoa)) tang ha hoi. hieu va chat luc van hanh vi cua tre*.