Perhaps you should try some spelling variations:
chuc nganh » chuc nang, hoc nganh, cac nganh
dau tren » dau tien, dat tren, dau tieng
luc ngan » luc nganh, luc nhan, luat ngan
hang di » hang doi, hang vi, hang dien
su sach » so sach
hieu ve » hieu va, hieu van
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang
vu sach » vu bach, vu khach
di dau » doi dau, bi dau, di du
ve cac » va cac, vien cac

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) OR (vu sach)) ty hang xa hoi. hieu ve cac ((chuc nganh) or (luc ngan)) hang di dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ty hang xa hoi. hieu ve cac ((chuc nganh) OR (luc ngan)) hang di dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ty hang xa hoi. hieu ve cac ((chuc nganh) or (luc ngan)) hang di dau tren".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ty hang xa hoi. hieu ve cac ((chuc nganh) or (luc ngan)) hang di dau tren*.