Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
dan vai » dan va, dan tai, dan vat
dan dan » dang dan, ban dan, dao dan
van bao » van ban, van dao
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
van ha » van hoa, van chat, van hanh
ma hoi » xa hoi, ma hoa, me hoi
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: su sach ky nang ((ma hoi) OR (mai hoi)). hieu ((van bao) OR (van ha)) thuc dan dan vai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((ma hoi) OR (mai hoi)). hieu ((van bao) or (van ha)) thuc dan dan vai cua te~".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((ma hoi) OR (mai hoi)). hieu ((van bao) or (van ha)) thuc dan dan vai cua te*.