Perhaps you should try some spelling variations:
thuat sach » thuat lanh
thuat san » thuat toan, thuat song, thuat lanh
lang va » lang van, hang va, lang ha
va lang » va nang, hoa lang
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
va cao » va cac, va co, va dao
y nang » ky nang, ly nang, v nang
va cua » va chua, via cua, ca cua
ve cao » ve bao, ve cac, ve co

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