Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
cau tren » cu tren, ca tren, cau treo
hanh vai » hanh vi, hanh va, hanh tai
va hanh » van hanh, va thanh, va danh
cam duc » cam xuc, cao duc, pham duc
te sach » toc sach
ky danh » ky anh
ky dang » ky nang
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
ma hoi » mai hoi, xa hoi, ma 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 ((ky dang) or (ky danh)) ma hoi. hieu ve cam duc va hanh vai ((cau tren) OR (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky dang) OR (ky danh)) ma hoi. hieu ve cam duc va hanh vai ((cau tren) OR (dau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky dang) or (ky danh)) ma hoi. hieu ve cam duc va hanh vai ((cau tren) OR (dau tren))".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky dang) or (ky danh)) ma hoi. hieu ve cam duc va hanh vai ((cau tren) OR (dau tren))*.