Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
duc manh » suc manh, duc anh, duc minh
ky sang » ky nang, ky tang, duy sang
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc phan
hai chu » hai chau, hoi chu, hai chi
chu tre » cho tre, chu tri, cuu tre
tu san » thu san, tu ban, tu can
ve cam » ve cham, ve cac, va cam

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) OR (duc manh)) thanh hai chu 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) OR (duc manh)) thanh hai chu 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) OR (duc manh)) thanh hai chu tre".
• Adding a wildcard symbol may retrieve word variants: tu san ((ky sang) or (ky dang)) xa hoi. hieu ve cam ((duc van) OR (duc manh)) thanh hai chu tre*.