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