Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ve triet » va trien, su triet
hoc sac » hoc sach, hoc cac, hoc mac
ky dang » ky danh
mai hoi » mai khoi, dai hoi, lai hoi
nam duc » nam duoc, pham duc, nam thuc
duc van » duc va, duc tan, duc manh
minh vi » minh voi, dinh vi, minh va
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ((ky dang) OR (ky nang)) mai hoi. hieu van nam duc van minh vi ((cua te) OR (ve triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sac ((ky dang) OR (ky nang)) mai hoi. hieu van nam duc van minh vi ((cua te) or (ve triet))~".
• Adding a wildcard symbol may retrieve word variants: hoc sac ((ky dang) OR (ky nang)) mai hoi. hieu van nam duc van minh vi ((cua te) or (ve triet))*.