Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
va hang » van hang, va nang, va lang
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
ve cao » va cao, ve bao, ve cac
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 (v nang)) xa hoi. hieu ve cao duc va hang ((va cua) or (ca cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat san ((y nang) OR (v nang)) xa hoi. hieu ve cao duc va hang ((va cua) OR (ca cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat san ((y nang) OR (v nang)) xa hoi. hieu ve cao duc va hang ((va cua) or (ca cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thuat san ((y nang) OR (v nang)) xa hoi. hieu ve cao duc va hang ((va cua) or (ca cua)) tre*.