Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cao tang » cao dang
phat xuc » chat xuc, phat xuat, phat huy
cua tre » cua te, cuu tre, cua triet
phap xu » phap tu, phap thu, phap ngu
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua
tu sai » tu bai, tu san, tu cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ((kho tang) OR (cao tang)) ma hoi. hieu va ((phat xuc) or (phap xu)) van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ((kho tang) OR (cao tang)) ma hoi. hieu va ((phat xuc) OR (phap xu)) van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ((kho tang) OR (cao tang)) ma hoi. hieu va ((phat xuc) or (phap xu)) van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sai ((kho tang) OR (cao tang)) ma hoi. hieu va ((phat xuc) or (phap xu)) van hanh vi cua tre*.