Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
ke trang » ke toan
trang va » tran van, hang va
van hanh » van thanh, ban hanh, van anh
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
luc van » luoc van, luu van, duc van
te sach » toc sach
sach ke » sach kem, sach de, sach che
ve cam » ve cac, va cam, ve cai
va hoi » xa hoi, va hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ke trang va hoi. hieu ((ve cam) OR (ve cham)) luc van hanh vi ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ke trang va hoi. hieu ((ve cam) OR (ve cham)) luc van hanh vi ((cua tre) OR (cau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ke trang va hoi. hieu ((ve cam) OR (ve cham)) luc van hanh vi ((cua tre) or (cau tren))*".