Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
thanh de » hanh de, thanh ve, thanh do
hieu va » lieu va, hieu qua
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
va cam » va cham, va cac, va cao
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 va cam ((luc va) or (tuc va)) thanh de cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ((ky tang) OR (ky dang)) xa hoi. hieu va cam ((luc va) OR (tuc va)) thanh de cau tren.
• Adding a wildcard symbol may retrieve word variants: tu san ((ky tang) or (ky dang)) xa hoi. hieu va cam ((luc va) or (tuc va)) thanh de cau tren*.