Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh thai » nhanh thai, hinh thai, hanh tai
van hanh » van thanh, ban hanh, van anh
va pham » van pham, va phat, va phap
cua tre » cua te, cuu tre, dua tren
duc van » duc va, duc tan, duc manh
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
su dai » sau dai, si dai, su tai
su sai » su tai, su hai, su mai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sai) or (su dai)) ky dang xa hoi. hieu va pham duc van hanh thai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sai) OR (su dai)) ky dang xa hoi. hieu va pham duc van hanh thai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sai) or (su dai)) ky dang xa hoi. hieu va pham duc van hanh thai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: ((su sai) or (su dai)) ky dang xa hoi. hieu va pham duc van hanh thai ((cua tre) OR (cua triet))*.