Perhaps you should try some spelling variations:
huong doi » huong dan, trong doi
hoc sach » hoc sinh, hoc cac, hoc anh
dung doi » dung tai, dung co, dung mo
cau treo » cau theo, cau tren, cau triet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac tu » cac thu, cach tu, 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: hoc sach ky nang xa hoi. hieu va ((cac tu) or (cac du)) va ((huong doi) OR (dung doi)) cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang xa hoi. hieu va ((cac tu) OR (cac du)) va ((huong doi) OR (dung doi)) cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang xa hoi. hieu va ((cac tu) or (cac du)) va ((huong doi) OR (dung doi)) cau treo".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang xa hoi. hieu va ((cac tu) or (cac du)) va ((huong doi) OR (dung doi)) cau treo*.