Perhaps you should try some spelling variations:
huong doi » huong dan, trong doi, dung doi
toc sach » hoc sach, doc sach, thuoc sach
va huong » va thuong, va phuong, va tuong
dua tren » dung tren
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, cac du
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: toc sach ky nang xa hoi. hieu va cac tu va huong doi ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. hieu va cac tu va huong doi ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu va cac tu va huong doi ((dua tren) or (cua te))*.