Perhaps you should try some spelling variations:
trinh viet » ninh viet, trinh vat
kho tang » cao tang
tang dai » tang tai, tang dan, lang dai
vu sach » vu bach, su sach, vu khach
tinh va » tich va, trinh van, trinh vat
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
dai moi » doi moi, dai hoi
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (te sach)) kho tang dai moi. hieu ve cam duc va ((tinh va) or (trinh viet)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (te sach)) kho tang dai moi. hieu ve cam duc va ((tinh va) OR (trinh viet)) cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (te sach)) kho tang dai moi. hieu ve cam duc va ((tinh va) or (trinh viet)) cua tre*.