Perhaps you should try some spelling variations:
nang hang » nang sang, hang hang, cang thang
dau tren » dau tien, dat tren, dau tieng
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
ve cham » va cham, ve chat, vu cham
hang di » hang doi, hang vi, hang dien
y nang » ky nang, ly nang, v nang
ve cam » ve cac, va cam, ve cai
di dau » doi dau, bi dau, di du

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang xa hoi. hieu ((ve cam) or (ve cham)) chuc nang hang di dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu ((ve cam) OR (ve cham)) chuc nang hang di dau tren.
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu ((ve cam) or (ve cham)) chuc nang hang di dau tren*.