Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
dang mau » dong mau, dang van, dang su
cau tren » cu tren, ca tren, cau treo
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
qua cam » qua cham, qua cac, qua ca
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
dang ma » dang mam, dang mat, tang ma
te sach » toc sach

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 ky ((dang ma) or (dang mau)) hoi. hieu qua cam luc van hanh vi ((cau tren) OR (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((dang ma) OR (dang mau)) hoi. hieu qua cam luc van hanh vi ((cau tren) OR (dau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((dang ma) or (dang mau)) hoi. hieu qua cam luc van hanh vi ((cau tren) OR (dau tren))*".