Perhaps you should try some spelling variations:
dang hoa » dang hoai, dang khoa, dong hoa
van hanh » van thanh, ban hanh, van anh
chat duc » chat xuc, chat doc, chet duoc
duc van » duc va, duc tan, duc manh
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
ky dang » ky nang, ky danh
vi cua » vai cua, di cua
su cac » tu cac, su cao, su can

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su cac) OR (((su xac) OR (pu xac)))) ky dang hoa hoc. hieu va chat duc van hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su cac) or (((su xac) OR (pu xac)))) ky dang hoa hoc. hieu va chat duc van hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su cac) or (((su xac) OR (pu xac)))) ky dang hoa hoc. hieu va chat duc van hanh vi cua tre*.