Perhaps you should try some spelling variations:
nganh sang » ngan hang, nganh cong, nhanh song
nang sang » nang song, nong san
dau tren » dau tien, dat tren, dau tieng
dang xay » dang van, van xay
cam luc » cam xuc, cau luc
te sach » toc sach
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, lang van
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty ((lang xa) or (dang xay)) hoi. hieu va cam luc ((nganh sang) OR (nang sang)) bi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((lang xa) OR (dang xay)) hoi. hieu va cam luc ((nganh sang) OR (nang sang)) bi dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((lang xa) or (dang xay)) hoi. hieu va cam luc ((nganh sang) OR (nang sang)) bi dau tren".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((lang xa) or (dang xay)) hoi. hieu va cam luc ((nganh sang) OR (nang sang)) bi dau tren*.