Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sach ty » sach y, sach tu, sach thu
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
luc va » tuc va, loc va
vi cau » va cau, ve cau, di cau

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 ty ((nang xa) OR (nang ma)) hoi. hieu ve cam ((duc va) OR (luc va)) hanh vi cau tren~.
• Adding a wildcard symbol may retrieve word variants: te sach ty ((nang xa) or (nang ma)) hoi. hieu ve cam ((duc va) or (luc va)) hanh vi cau tren*.