Perhaps you should try some spelling variations:
nganh hang » ngan hang, nhanh thang, nganh thanh
luc nganh » luc ngan, chuc nganh, luat nganh
dau tien » van tien
dang xay » dang van, van xay
dau tren » dat tren, dau tieng, dau trong
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
lang xa » lang ha, lang van
hang bi » hang di, hang vi, sang bi
tu sach » thu sach, su sach, te sach

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 ((lang xa) or (dang xay)) hoi. hieu va cac luc nganh hang bi ((dau tren) OR (dau tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((lang xa) OR (dang xay)) hoi. hieu va cac luc nganh hang bi ((dau tren) OR (dau tien))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((lang xa) or (dang xay)) hoi. hieu va cac luc nganh hang bi ((dau tren) OR (dau tien))*".