Perhaps you should try some spelling variations:
chuc nganh » chuc nang, hoc nganh, cac nganh
luc nganh » luc ngan, luat nganh, luc canh
cau tren » cu tren, dau tren, ca tren
hang vi » hang va, hanh vi, hang di
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ty lang » tay lang, ty hang, tu lang
vi cau » va cau, ve cau, di cau
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: tu sach ((ty lang) or (ty xang)) xa hoi. hieu ve cam ((luc nganh) OR (chuc nganh)) hang vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty lang) OR (ty xang)) xa hoi. hieu ve cam ((luc nganh) OR (chuc nganh)) hang vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty lang) or (ty xang)) xa hoi. hieu ve cam ((luc nganh) OR (chuc nganh)) hang vi cau tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty lang) or (ty xang)) xa hoi. hieu ve cam ((luc nganh) OR (chuc nganh)) hang vi cau tren*.