Perhaps you should try some spelling variations:
dang hoa » dang hoai, dang khoa, dong hoa
chat duc » chat xuc, chat doc, chet duoc
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
va hanh » van hanh, va thanh, va danh
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
su sac » su sach, su cac
su xac » pu xac, su cac

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 va hanh vi ((cuu tre) OR (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 va hanh vi ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) or (su xac)) ky dang hoa hoc. hieu va chat duc va hanh vi ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su xac)) ky dang hoa hoc. hieu va chat duc va hanh vi ((cuu tre) OR (cua tre))*.