Perhaps you should try some spelling variations:
tinh dai » trinh dai, tinh da, tinh hai
nang dau » hang dau, xang dau, nang du
thuc va » thuc vat, thuc dan, thuc day
sach ky » sac ky, sach y, sach kem
hieu ve » hieu va, hieu van
dau hoi » cau hoi, dai hoi, dan hoi
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
tuc va » truc va, tuc xa, duc va

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 ky) or (sach ty)) nang dau hoi. hieu ve cac ((tuc va) or (thuc va)) tinh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) nang dau hoi. hieu ve cac ((tuc va) OR (thuc va)) tinh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach ty)) nang dau hoi. hieu ve cac ((tuc va) or (thuc va)) tinh dai cua tre*.