Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu tang » tuc tang, tu trang, tu tong
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
cam duc » cao duc, pham duc, nam duoc
hanh ki » hanh vi, hanh ky, hanh kien
ma hoi » mai hoi, xa hoi, ma hoa
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tu tang ma hoi. hieu va ((cam duc) or (cam xuc)) van hanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu tang ma hoi. hieu va ((cam duc) OR (cam xuc)) van hanh ki su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach tu tang ma hoi. hieu va ((cam duc) or (cam xuc)) van hanh ki su triet*.