Perhaps you should try some spelling variations:
thanh de » hanh de, thanh ve, thanh do
hieu van » hieu va, thien van, lieu va
cau tre » cau tren, cau treo, cau tra
van cam » van nam, van lam, van cau
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
de cau » ke cau, le cau, ve cau
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 tang) or (ky dang)) xa hoi. hieu van cam ((luc va) OR (tuc va)) thanh de cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ((ky tang) OR (ky dang)) xa hoi. hieu van cam ((luc va) OR (tuc va)) thanh de cau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ((ky tang) or (ky dang)) xa hoi. hieu van cam ((luc va) OR (tuc va)) thanh de cau tre".
• Adding a wildcard symbol may retrieve word variants: tu san ((ky tang) or (ky dang)) xa hoi. hieu van cam ((luc va) OR (tuc va)) thanh de cau tre*.