Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
dinh ven » dinh van, tinh ven, dinh viet
kho tang » cao tang
ky tang » ky nang, ky dang, ky trong
hieu va » lieu va, hieu qua
dinh ve » dinh ket, dinh van
cao luc » bao luc, cao duc, cao suc
te ban » te bao
luc va » duc va, tuc va, loc va
va cao » va cac, va co, va dao

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

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