Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hang loi » thang loi, tang loi, thanh loi
hang doi » hang di, huong doi, hang tai
cach tu » cach thuc
cuu tre » cua tre, cau tren, cau treo
sach tu » sach thu, sach ty, sach uu
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
cac tu » cac thu, cac du, tac tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tu nang xa hoi. hieu va ((cac tu) OR (cach tu)) va ((hang doi) or (hang loi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu nang xa hoi. hieu va ((cac tu) OR (cach tu)) va ((hang doi) OR (hang loi)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tu nang xa hoi. hieu va ((cac tu) OR (cach tu)) va ((hang doi) or (hang loi)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc sach tu nang xa hoi. hieu va ((cac tu) OR (cach tu)) va ((hang doi) or (hang loi)) cuu tre*.