Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
dao duc » giao duc, tao duoc
va dinh » van dinh, va kinh, va tinh
dinh va » dinh van, dinh ve, tinh va
va cua » va chua, via cua, ca cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach tru nang xa hoi. ((hieu va) OR (hieu qua)) dao duc va dinh va cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach tru nang xa hoi. ((hieu va) OR (hieu qua)) dao duc va dinh va cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach tru nang xa hoi. ((hieu va) OR (hieu qua)) dao duc va dinh va cua te*.