Perhaps you should try some spelling variations:
nganh hang » ngan hang, nhanh thang, nganh thanh
luc nganh » luc ngan, chuc nganh, luat nganh
sach thi » sach thu, sach tai, sach thieu
sach bai » sach dao, cac bai, sach xa
hieu van » hieu va, thien van, lieu va
dat tren » dat trong, dua tren
cong xa » cong xay, cong xua, cong ha
van cam » van nam, van lam, van cau
cam luc » cam xuc, cau luc
hang di » hang doi, hang vi, hang dien
di dat » de dat, di vat, dinh dat

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach thi) or (sach bai)) cong xa hoi. hieu van cam luc nganh hang di dat tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thi) OR (sach bai)) cong xa hoi. hieu van cam luc nganh hang di dat tren.
• Adding a wildcard symbol may retrieve word variants: tu ((sach thi) or (sach bai)) cong xa hoi. hieu van cam luc nganh hang di dat tren*.