Perhaps you should try some spelling variations:
va gianh » va gian, van giang, va giai
pham duy » pham duc
te sach » toc sach
vu pham » su pham, vi pham, vu kham
lai cua » hai cua, lai chau, thai cua
hieu vu » hieu va, hieu ve, hieu su
tay hoi » tay ho, tao hoi, tay thai
ky dang » ky nang, ky danh
ky mang » ky nang, ke mang, ky tang
duy va » duy vat, duy van, day va

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