Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
hanh de » hanh ve, hanh kem
xuc van » duc van, luc van, vuc van
hieu ve » hieu va, hieu van
bang xa » lang xa, bang va, mang xa
ve cam » ve cham, ve cac, va cam
de cua » le cua, te cua, dieu cua
cua cu » cua chu, cua cau, cua su

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) OR (toc sach)) thu ((bang xa) or (mang may)) hoi. hieu ve cam xuc van hanh de cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) thu ((bang xa) OR (mang may)) hoi. hieu ve cam xuc van hanh de cua cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) thu ((bang xa) or (mang may)) hoi. hieu ve cam xuc van hanh de cua cu".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) thu ((bang xa) or (mang may)) hoi. hieu ve cam xuc van hanh de cua cu*.