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

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