Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
duc van » duc va, duc tan, duc manh
hai chi » thai chi, tai chi, hai thi
hai chu » hai chau, hoi chu, hai phu
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
ky sang » ky nang, ky tang, duy sang
ve cam » ve cham, ve cac, va cam
tu san » thu san, tu ban, tu can

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 ((ky sang) or (ky dang)) xa hoi. hieu ve cam duc van thanh ((hai chu) OR (hai chi)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ((ky sang) OR (ky dang)) xa hoi. hieu ve cam duc van thanh ((hai chu) OR (hai chi)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ((ky sang) or (ky dang)) xa hoi. hieu ve cam duc van thanh ((hai chu) OR (hai chi)) tre".
• Adding a wildcard symbol may retrieve word variants: tu san ((ky sang) or (ky dang)) xa hoi. hieu ve cam duc van thanh ((hai chu) OR (hai chi)) tre*.