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