Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
huong doi » huong dan, dung doi
so sach » so sanh, bo sach, co sach
ty nang » ty xang, ty hang, ly nang
hieu ve » hieu va, hieu van
ve tham » va tham, ve cham, vi tham
thuc xa » thuc xay, tuc xa, thuc va
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: so sach ((ty nang) OR (ky nang)) xa hoi. hieu ve tham thuc 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) OR (ky nang)) xa hoi. hieu ve tham thuc 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) OR (ky nang)) xa hoi. hieu ve tham thuc xa ((huong doi) or (trong doi)) cua te".
• Adding a wildcard symbol may retrieve word variants: so sach ((ty nang) OR (ky nang)) xa hoi. hieu ve tham thuc xa ((huong doi) or (trong doi)) cua te*.