Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang dai » nang dau, nang tai, lang dai
hanh hai » thanh hai, nhanh hai, hang hai
dai hai » dai han, dai hoi, dai tai
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, 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 nang dai hai. hieu va 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 va 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 va cac duc va hanh hai ((cua tre) or (cua triet))*.