Perhaps you should try some spelling variations:
trinh viet » ninh viet, trinh vat
dinh viet » ninh viet, danh viet, sinh vien
te sach » toc sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
cac dac » cac dan, cac dai, cac bac
ve cac » va cac, vien cac
dac va » duc va, day va, dat va
y xang » ty xang
ma hoi » xa hoi, ma hoa, me hoi
ca tre » ca tren, cua tre, ca tru

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y xang ((ma hoi) or (mai hoi)). hieu ve cac dac va ((dinh viet) OR (trinh viet)) ca tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y xang ((ma hoi) OR (mai hoi)). hieu ve cac dac va ((dinh viet) OR (trinh viet)) ca tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y xang ((ma hoi) or (mai hoi)). hieu ve cac dac va ((dinh viet) OR (trinh viet)) ca tre*".