Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh dao » lanh dao, thanh dat, thanh dam
ban hanh » ban hang
vien cac » vien bach, vien dai, gian cac
vien da » vien dai, hien dai
sach tu » sach thu, cach tu, sach ty
xuc ban » duc ban, cuc ban, quoc ban
tu nong » tu dong, tu cong, tu tong
dao cua » dai cua, day cua, dan cua
ma hoi » mai hoi, ma hoa, me hoi
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach tu nong ((ma hoi) OR (xa hoi)). hieu ((vien cac) or (vien da)) xuc ban hanh dao cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach tu nong ((ma hoi) OR (xa hoi)). hieu ((vien cac) OR (vien da)) xuc ban hanh dao cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach tu nong ((ma hoi) OR (xa hoi)). hieu ((vien cac) or (vien da)) xuc ban hanh dao cua su".
• Adding a wildcard symbol may retrieve word variants: hoc sach tu nong ((ma hoi) OR (xa hoi)). hieu ((vien cac) or (vien da)) xuc ban hanh dao cua su*.