Perhaps you should try some spelling variations:
thuat sach » thuat san
thuat lanh » thuat lap, thuat san
cua tre » cua te, cua triet, dua tren
va hang » van hang, va nang, va lang
cao duc » dao duc, cao suc, giao duc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo
ve cao » va cao, ve bao, ve cac
y nang » ky nang, ly nang, v nang

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

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