Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
cong xay » thong xay, trong xay, cong ty
hieu van » hieu va, thien van, lieu va
mong xay » thong xay, trong xay, luong xay
sach ly » sach y, sach lo, sach ty
nam xuc » cam xuc, nam xua, nam thuc
su sach » so sach, vu sach
xuc va » duc va, tuc va, luc va
do hai » do thai, doc hai, do dai
va do » va dao, va doc, va co

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ly ((mong xay) or (cong xay)) hoi. hieu van nam xuc va do hai ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly ((mong xay) OR (cong xay)) hoi. hieu van nam xuc va do hai ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: su sach ly ((mong xay) or (cong xay)) hoi. hieu van nam xuc va do hai ((cua triet) or (cua viet))*.