Perhaps you should try some spelling variations:
viet cua » viec cua, viet ca, viet qua
dang xay » dang van, van xay
sach ty » sach y, sach thu, xach tay
van anh » van thanh, tuan anh, van minh
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
sach tu » sach thu, cach tu, sach uu
ve cac » va cac, vien cac
cac lo » cac lop, cac co, cac bo
lo van » le van, vo van, so van
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach ty) OR (sach tu)) ((dang xay) OR (nang ma)) hoi. hieu ve cac lo van anh viet cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc ((sach ty) OR (sach tu)) ((dang xay) or (nang ma)) hoi. hieu ve cac lo van anh viet cua te~".
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ty) OR (sach tu)) ((dang xay) or (nang ma)) hoi. hieu ve cac lo van anh viet cua te*.