Perhaps you should try some spelling variations:
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
te sach » toc sach
va dinh » van dinh, va kinh, va tinh
va danh » va dan, va hanh, dia danh
van hao » van dao, van ha, van bao
van cao » van dao, van bao, van cau
nang xa » nang x, lang xa, nang ma
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: te sach tru nang xa hoi. hieu ((van cao) or (van hao)) duc ((va danh) OR (va dinh)) va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tru nang xa hoi. hieu ((van cao) OR (van hao)) duc ((va danh) OR (va dinh)) va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tru nang xa hoi. hieu ((van cao) or (van hao)) duc ((va danh) OR (va dinh)) va cua te".
• Adding a wildcard symbol may retrieve word variants: te sach tru nang xa hoi. hieu ((van cao) or (van hao)) duc ((va danh) OR (va dinh)) va cua te*.