Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, cau treo
te sach » toc sach
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
ca tren » cu tren, la tren, co tren
sang ma » tang ma, nang ma, sang tao
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa

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: te sach y ((nang x) OR (sang ma)) hoi. hieu ve cac tuc va danh di ((cau tren) OR (ca tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang x) or (sang ma)) hoi. hieu ve cac tuc va danh di ((cau tren) OR (ca tren))~".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang x) or (sang ma)) hoi. hieu ve cac tuc va danh di ((cau tren) OR (ca tren))*.