Perhaps you should try some spelling variations:
dua tren » dung tren
hieu van » hieu va, thien van, lieu va
cu tren » tu tren
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
sach ky » sach y, sach ty, sach kem
van cau » van dau, van hau, van chat
cau xuc » cam xuc, cau luc, cau truc
xuc va » duc va, tuc va, luc va
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho

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 ky) OR (sac ky)) nang x hoi. hieu van cau xuc va danh vi ((cu tren) or (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang x hoi. hieu van cau xuc va danh vi ((cu tren) OR (dua tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) nang x hoi. hieu van cau xuc va danh vi ((cu tren) or (dua tren))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) nang x hoi. hieu van cau xuc va danh vi ((cu tren) or (dua tren))*.