Perhaps you should try some spelling variations:
dan trinh » dan tinh, van trinh, hanh trinh
ban trinh » ban tinh, van trinh, hanh trinh
cau tren » cu tren, dau tren, ca tren
dang xay » dang van, van xay
cac cua » cach cua, cac qua, ca cua
tu sach » thu sach, su sach, tu cach
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
te sach » toc sach
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
va cau » van cau, va cac, va dau

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 ve cac cua ((ban trinh) OR (dan trinh)) va cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky dang xay hoi. hieu ve cac cua ((ban trinh) OR (dan trinh)) va cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky dang xay hoi. hieu ve cac cua ((ban trinh) OR (dan trinh)) va cau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky dang xay hoi. hieu ve cac cua ((ban trinh) OR (dan trinh)) va cau tren*.