Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
dang xay » dang van, van xay
te sach » toc sach
va danh » va dinh, va dan, va hanh
cac duc » cac du, cao duc, cac dac
tu sach » thu sach, su sach, tu cach
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
ca san » cac san, cua san, ca dan

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) or (te sach)) ky dang xay hoi. hieu vien cac duc va danh ((ca sau) OR (ca san)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky dang xay hoi. hieu vien cac duc va danh ((ca sau) OR (ca san)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky dang xay hoi. hieu vien cac duc va danh ((ca sau) OR (ca san)) triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky dang xay hoi. hieu vien cac duc va danh ((ca sau) OR (ca san)) triet*.