Perhaps you should try some spelling variations:
luc nganh » luc ngan, chuc nganh, luat nganh
dau tren » dau tien, dat tren, dau tieng
sach ty » sach y, sach thu, xach tay
hang di » hang doi, hang dien, hang dich
hang vi » hang va, hanh vi, khang voi
cam luc » cam xuc, cau luc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sach tu » sach thu, cach tu, sach uu
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) or (sach tu)) nang xa hoi. hieu ve cam luc nganh ((hang vi) OR (hang di)) dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach tu)) nang xa hoi. hieu ve cam luc nganh ((hang vi) OR (hang di)) dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach tu)) nang xa hoi. hieu ve cam luc nganh ((hang vi) OR (hang di)) dau tren".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach tu)) nang xa hoi. hieu ve cam luc nganh ((hang vi) OR (hang di)) dau tren*.