Perhaps you should try some spelling variations:
kho lang » kho tang, tho lang, khoai lang
cho lang » cho hang, chi lang, cho mang
va gianh » va gian, van giang, va giai
te sach » toc sach
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
lai cua » hai cua, lai chau, thai cua
ve cac » va cac, vien cac

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 ((kho lang) OR (cho lang)) xa hoi. hieu ve cac duc va gianh ((lai cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((kho lang) OR (cho lang)) xa hoi. hieu ve cac duc va gianh ((lai cua) OR (dai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((kho lang) OR (cho lang)) xa hoi. hieu ve cac duc va gianh ((lai cua) or (dai cua)) te".
• Adding a wildcard symbol may retrieve word variants: te sach ((kho lang) OR (cho lang)) xa hoi. hieu ve cac duc va gianh ((lai cua) or (dai cua)) te*.