Perhaps you should try some spelling variations:
chuc nganh » chuc nang, hoc nganh, cac nganh
luc nganh » luc ngan, luat nganh, luc canh
tu sach » thu sach, su sach, te sach
la tren » loai tren, dua tren, dat tren
hang vi » hang va, hanh vi, hang di
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang
cu tren » tu tren, dua tren
ve cau » ke cau, va cau, ve cac

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 ve cau ((luc nganh) OR (chuc nganh)) hang vi ((la tren) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hang xa hoi. hieu ve cau ((luc nganh) OR (chuc nganh)) hang vi ((la tren) OR (cu tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty hang xa hoi. hieu ve cau ((luc nganh) OR (chuc nganh)) hang vi ((la tren) or (cu tren))*".