Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
than cua » nhan cua, thai cua, ban cua
ky dang » ky nang
ky danh » ky anh
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
duc van » duc va, duc tan, duc manh
su sai » su tai, su hai, su dai

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 ((ky dang) OR (ky danh)) xa hoi. hieu ve pham duc van hanh ((than cua) or (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ((ky dang) OR (ky danh)) xa hoi. hieu ve pham duc van hanh ((than cua) OR (tai cuc)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ((ky dang) OR (ky danh)) xa hoi. hieu ve pham duc van hanh ((than cua) or (tai cuc)) tre".
• Adding a wildcard symbol may retrieve word variants: su sai ((ky dang) OR (ky danh)) xa hoi. hieu ve pham duc van hanh ((than cua) or (tai cuc)) tre*.