Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
thi hang » thi hanh, thi nang, thi hong
thanh vi » hanh vi, thanh va, thanh ve
vu sach » vu bach, su sach, vu khach
xuc ban » duc ban, cuc ban, quoc ban
hanh ve » hanh vi, hanh va, hanh kem
qua cua » quan cua, quang cua, qua quan
cua xuc » cua duc, cua tuc, cua cuc
hang ca » hang va, nang cao, hang tai
ca hoi » cau hoi, cua hoi, xa hoi
cua te » cua tu

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 (hoc sach)) thi hang ca hoi. hieu qua cua xuc ban ((thanh vi) or (hanh ve)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (hoc sach)) thi hang ca hoi. hieu qua cua xuc ban ((thanh vi) OR (hanh ve)) cua te.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (hoc sach)) thi hang ca hoi. hieu qua cua xuc ban ((thanh vi) or (hanh ve)) cua te*.