Perhaps you should try some spelling variations:
dang hoa » dang hoai, dang khoa, dong hoa
chat duc » chat xuc, chat doc, chet duoc
ban hanh » ban hang
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
su sac » su sach, su cac
su xac » pu xac, su cac
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: ((su sac) or (su xac)) ky dang hoa hoc. hieu va chat duc ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su xac)) ky dang hoa hoc. hieu va chat duc ban hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su xac)) ky dang hoa hoc. hieu va chat duc ban hanh vi cua tre*.