Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
dua tren » dung tren
hieu van » hieu va, thien van, lieu va
xua ban » xuat ban, cua ban, qua ban
hanh ve » hanh vi, hanh va, hanh kem
nam xua » nam cua, nam mua, nam qua
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky, sai ky
anh ve » anh va, anh viet, thanh ve
ma hoi » mai hoi, xa hoi, ma hoa
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang ma hoi. hieu van nam xua ban ((anh ve) OR (hanh ve)) ((dua tren) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ma hoi. hieu van nam xua ban ((anh ve) OR (hanh ve)) ((dua tren) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ma hoi. hieu van nam xua ban ((anh ve) OR (hanh ve)) ((dua tren) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ma hoi. hieu van nam xua ban ((anh ve) OR (hanh ve)) ((dua tren) or (cua viet))*.