Perhaps you should try some spelling variations:
luc nganh » luc ngan, chuc nganh, luat nganh
dau tren » dau tien, dat tren, dau tieng
hang doi » hang loi, huong doi, hang tai
cam luc » cam xuc, cau luc
hang di » hang vi, hang dien, hang dich
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
ve cam » ve cham, ve cac, va cam

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 ty ((nang xa) OR (lang xa)) hoi. hieu ve cam luc nganh ((hang di) or (hang doi)) dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (lang xa)) hoi. hieu ve cam luc nganh ((hang di) OR (hang doi)) dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) OR (lang xa)) hoi. hieu ve cam luc nganh ((hang di) or (hang doi)) dau tren".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) OR (lang xa)) hoi. hieu ve cam luc nganh ((hang di) or (hang doi)) dau tren*.