Perhaps you should try some spelling variations:
sach kem » hanh kem
hang tai » hang va, dung tai
hanh tai » thanh tai, han tai, hinh tai
nang dau » hang dau, xang dau, nang du
xuc van » duc van, luc van, vuc van
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 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: su ((sach kem) or (sach ty)) nang dau hoi. hieu ve cam xuc van ((hanh tai) OR (hang tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach kem) OR (sach ty)) nang dau hoi. hieu ve cam xuc van ((hanh tai) OR (hang tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach kem) or (sach ty)) nang dau hoi. hieu ve cam xuc van ((hanh tai) OR (hang tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach kem) or (sach ty)) nang dau hoi. hieu ve cam xuc van ((hanh tai) OR (hang tai)) cua tre*.