Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
van tuan » van quan, van ban, anh tuan
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu van
hieu va » lieu va, hieu qua
duc van » duc va, duc tan, duc manh
su cac » tu cac, su cao, su can

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

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