Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam duoc » nam thuoc, da duoc, dat duoc
dang xay » dang van, van xay
ca tren » cau tren, cu tren, la tren
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
vu sach » vu bach, su sach, vu khach
nam duc » pham duc, nam thuc, nam buoc
xay hoi » xa hoi, tay hoi, cay phoi
y dang » ky dang, 2 dang, _ dang

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y dang xay hoi. lieu va ((nam duc) OR (nam duoc)) va hanh va ((ca tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y dang xay hoi. lieu va ((nam duc) OR (nam duoc)) va hanh va ((ca tren) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y dang xay hoi. lieu va ((nam duc) OR (nam duoc)) va hanh va ((ca tren) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: vu sach y dang xay hoi. lieu va ((nam duc) OR (nam duoc)) va hanh va ((ca tren) or (cua triet))*.