Perhaps you should try some spelling variations:
manh vanh » mach vanh, anh anh, manh binh
duc manh » suc manh, duc anh, duc minh
vanh tai » van tai, hanh tai, anh tai
ky dang » ky danh
hieu vi » hieu voi, hieu va, hieu ve
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
su dai » sau dai, si dai, su tai
pham » phan

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

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