Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
can thuc » dan thuc, cay thuc, san thuc
van thuc » va thuc, dan thuc, van thu
day hanh » day nhanh, day thanh, dao hanh
hanh hai » thanh hai, nhanh hai, hang hai
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

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 thu nang xa hoi. ((hieu va) or (lieu va)) ((can thuc) OR (van thuc)) day hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu nang xa hoi. ((hieu va) OR (lieu va)) ((can thuc) OR (van thuc)) day hanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu nang xa hoi. ((hieu va) or (lieu va)) ((can thuc) OR (van thuc)) day hanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach thu nang xa hoi. ((hieu va) or (lieu va)) ((can thuc) OR (van thuc)) day hanh hai cua tre*.