Perhaps you should try some spelling variations:
dang xay » dang van, van xay
dinh vai » dinh van, dinh vi, dinh tai
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu dang » thu dang, tu dong, su dang
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
dinh va » dinh van, dinh ve, tinh va
am hoc » ad hoc
ve am » va am

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 tu dang xay hoi. hieu ve am hoc va ((dinh vai) or (dinh va)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu dang xay hoi. hieu ve am hoc va ((dinh vai) OR (dinh va)) cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach tu dang xay hoi. hieu ve am hoc va ((dinh vai) or (dinh va)) cau tren*.