Perhaps you should try some spelling variations:
danh cong » dang cong, hanh cong, anh cong
hieu van » hieu va, thien van, lieu va
cong cua » cong cu, dong cua, huong cua
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
tu sach » thu sach, su sach, te sach
va danh » va dinh, va dan, va hanh
cac xuc » cam xuc, chat xuc, cac cuoc
mang xa » lang xa, mang may, dang xay
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet

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