Perhaps you should try some spelling variations:
danh cong » dang cong, hanh cong, anh cong
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
mang xa » lang xa, mang may, dang xay
van bac » van ban, van bao, van hac
va danh » va dinh, va dan, va hanh
cua tre » cuu tre, cua triet, dua tren
xuc va » duc va, tuc va, luc va
cua te » cua tu

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 y ((mang xa) or (nang x)) hoi. hieu van bac xuc va danh cong ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((mang xa) OR (nang x)) hoi. hieu van bac xuc va danh cong ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach y ((mang xa) or (nang x)) hoi. hieu van bac xuc va danh cong ((cua tre) or (cua te))*.