Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va triet » va thiet, va trien, ve triet
tuan vai » tuan tai, trang vai, tuan khai
van tuan » van quan, van ban, anh tuan
duc van » duc va, duc tan, duc manh
hoc sac » hoc sach, hoc cac, hoc mac
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
cam duc » cam xuc, cao duc, pham duc
sac ky » cac ky, sai ky
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: hoc sac ky tang ma hoi. hieu ve cam duc van tuan vai ((va triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky tang ma hoi. hieu ve cam duc van tuan vai ((va triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: hoc sac ky tang ma hoi. hieu ve cam duc van tuan vai ((va triet) or (su triet))*.