Perhaps you should try some spelling variations:
bang thanh » ban thanh, dang thanh, tang thanh
te sach » toc sach
cham so » cham soc, cham o, ham so
hai cua » thai cua, dai cua, hoi cua
vai cua » dai cua, lai cua, bai cua
so bang » so dang, so lang, co bang
ve cham » va cham, ve chat, vu cham
sach ly » sach y, sach lo, sach ty
hieu ve » hieu va, hieu van
ly nang » ky nang, ly hang, ly vang
o hoc » mo hoc, so hoc, y hoc

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 ly nang ((o hoc) or (co hoc)). hieu ve cham so bang thanh ((vai cua) or (hai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang ((o hoc) OR (co hoc)). hieu ve cham so bang thanh ((vai cua) OR (hai cua)) te.
• Adding a wildcard symbol may retrieve word variants: te sach ly nang ((o hoc) or (co hoc)). hieu ve cham so bang thanh ((vai cua) or (hai cua)) te*.