Perhaps you should try some spelling variations:
cau tren » dau tren, ca tren, cau treo
tinh loi » tinh luoi, tinh doi, dinh loi
sach thu » sach thue, sach thieu, sach tham
te sach » toc sach
va tinh » may tinh
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
cu tren » tu tren, dua tren
ve cam » ve cham, ve cac, va cam
cam tu » cam thu, nam tu, dam 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: te sach thu ((nang xa) OR (nang ma)) hoi. hieu ve cam tu va tinh loi ((cau tren) OR (cu tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu ((nang xa) OR (nang ma)) hoi. hieu ve cam tu va tinh loi ((cau tren) or (cu tren))~".
• Adding a wildcard symbol may retrieve word variants: te sach thu ((nang xa) OR (nang ma)) hoi. hieu ve cam tu va tinh loi ((cau tren) or (cu tren))*.