Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
ky tang » ky nang, kho tang, ky trong
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
hanh ve » hanh vi, hanh va, hanh kem
ve cau » ke cau, va cau, ve cac
te san » te ban, ke san, tu san
loc va » luc va
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te san ((ky tang) OR (ky dang)) xa hoi. hieu va cam ((loc va) or (hoc va)) hanh ve cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ((ky tang) OR (ky dang)) xa hoi. hieu va cam ((loc va) OR (hoc va)) hanh ve cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te san ((ky tang) OR (ky dang)) xa hoi. hieu va cam ((loc va) or (hoc va)) hanh ve cau tren".
• Adding a wildcard symbol may retrieve word variants: te san ((ky tang) OR (ky dang)) xa hoi. hieu va cam ((loc va) or (hoc va)) hanh ve cau tren*.