Perhaps you should try some spelling variations:
luc nganh » luc ngan, chuc nganh, luat nganh
dua tren » dung tren
co tren » cu tren, do tren, ca tren
hang di » hang doi, hang vi, hang dien
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang
va cau » van cau, va cac, va dau

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 ty hang xa hoi. hieu va cau ((luc nganh) or (luat doanh)) hang di ((co tren) or (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hang xa hoi. hieu va cau ((luc nganh) OR (luat doanh)) hang di ((co tren) OR (dua tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty hang xa hoi. hieu va cau ((luc nganh) or (luat doanh)) hang di ((co tren) or (dua tren))*.