Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh hai » thanh hai, nhanh hai, hang hai
nang dai » nang dau, nang tai, lang dai
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, dua tren
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
dai hai » dai han, dai hoi, dai tai
ve cac » va cac, vien cac
su xac » pu xac, su cac
su sac » su sach, 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 nang dai hai. hieu ve cac duc va hanh hai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su xac)) ky nang dai hai. hieu ve cac duc va hanh hai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) or (su xac)) ky nang dai hai. hieu ve cac duc va hanh hai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su xac)) ky nang dai hai. hieu ve cac duc va hanh hai ((cua tre) OR (cua triet))*.