Perhaps you should try some spelling variations:
va gianh » va gian, van giang, va giai
cham duc » pham duc, cham soc, pham duy
hieu vu » hieu va, hieu ve, hieu su
lai cua » hai cua, lai chau, thai cua
vu cham » va cham, vu kham, tu cham
te sach » toc sach
sach ky » sac ky, sach y, sach ty
tao hoi » tao khoi, tao boi, thao hoc
tay hoi » tay ho, tay thai
ky bang » ky nang, ky dang, ke bang

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 ((tay hoi) OR (tao hoi)). hieu vu 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 ((tay hoi) OR (tao hoi)). hieu vu 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 ((tay hoi) OR (tao hoi)). hieu vu cham duc va gianh ((lai cua) or (dai cua)) te".
• Adding a wildcard symbol may retrieve word variants: te sach ky bang ((tay hoi) OR (tao hoi)). hieu vu cham duc va gianh ((lai cua) or (dai cua)) te*.