Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
va lang » va nang, hoa lang
cao duc » dao duc, cao suc, giao duc
hieu va » lieu va, hieu qua
ly hang » ly quang
va cao » va cac, va co, va dao
y nang » ky nang, ly nang, v nang
va cua » va chua, via cua, ma cua
ca cua » co cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat san ((y nang) or (ly hang)) xa hoi. hieu va cao duc va lang ((va cua) OR (ca cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat san ((y nang) OR (ly hang)) xa hoi. hieu va cao duc va lang ((va cua) OR (ca cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat san ((y nang) or (ly hang)) xa hoi. hieu va cao duc va lang ((va cua) OR (ca cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thuat san ((y nang) or (ly hang)) xa hoi. hieu va cao duc va lang ((va cua) OR (ca cua)) tre*.