Perhaps you should try some spelling variations:
va gianh » va gian, van giang, va giai
cham duc » pham duc, cham soc, pham duy
hieu va » lieu va, hieu qua
lai cua » hai cua, lai chau, thai cua
va cham » va chat, va tham
te sach » toc sach
tay hoi » tay ho, tao hoi, tay thai
ke bang » ke mang, ke nang, ke ban
ky bang » ky nang, ky dang, ky tang

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