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