Perhaps you should try some spelling variations:
van tuan » van quan, van ban, anh tuan
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
duc van » duc va, duc tan, duc manh
tu san » thu san, tu ban, vu san
tu can » tu ban, tu cac, thu canh
qua ca » qua cac, qua cua, qua cai
ca duc » cao duc, cua duc, ca dua
di cua » doi cua, de cua, do cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu san) OR (tu can)) ky lang xa hoi. hieu qua ca duc van tuan ((di cua) or (dai cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu san) OR (tu can)) ky lang xa hoi. hieu qua ca duc van tuan ((di cua) OR (dai cua)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu san) OR (tu can)) ky lang xa hoi. hieu qua ca duc van tuan ((di cua) or (dai cua)) viet".
• Adding a wildcard symbol may retrieve word variants: ((tu san) OR (tu can)) ky lang xa hoi. hieu qua ca duc van tuan ((di cua) or (dai cua)) viet*.