Perhaps you should try some spelling variations:
huong doi » huong dan, dung doi
so sach » so sanh, bo sach, co sach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
cua te » cua tu
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty nang xa hoi. hieu ((ve cam) OR (ve cac)) tuc xa ((huong doi) or (trong doi)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang xa hoi. hieu ((ve cam) OR (ve cac)) tuc xa ((huong doi) OR (trong doi)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang xa hoi. hieu ((ve cam) OR (ve cac)) tuc xa ((huong doi) or (trong doi)) cua te".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang xa hoi. hieu ((ve cam) OR (ve cac)) tuc xa ((huong doi) or (trong doi)) cua te*.