Perhaps you should try some spelling variations:
cham hoc » cham soc, chat hoc, cham hoi
xanh tai » hanh tai, anh tai, vanh tai
xanh di » danh di, vanh dai
vu cham » va cham, vu kham, tu cham
cua tre » cua te, cuu tre, cua triet
hieu vu » hieu va, hieu ve, hieu su
sach v » sach va, sach 2, sach vay
x hoi » xa hoi, o hoi, x ho

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 v) or (sach y)) nang x hoi. hieu vu cham hoc va ((xanh di) OR (xanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach v) OR (sach y)) nang x hoi. hieu vu cham hoc va ((xanh di) OR (xanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach v) or (sach y)) nang x hoi. hieu vu cham hoc va ((xanh di) OR (xanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach y)) nang x hoi. hieu vu cham hoc va ((xanh di) OR (xanh tai)) cua tre*.