Perhaps you should try some spelling variations:
phan nghien » luan nghien
thuat hanh » thuat thanh, thuat lanh, thuat hinh
nuoc sach » nguoi sach, hoc sach, cuoc cach
sach nghe » sach nghiep, sach nha, anh nghe
nghiep tu » nghiep vu, nghiep vua, nghiep cua
tu hoc » te hoc
d hoc » du hoc, ad hoc, de hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( thuat hanh ((phan nghien) OR (phap nghien)) d hoc ) or ( nuoc sach nghe nghiep tu hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuat hanh ((phan nghien) OR (phap nghien)) d hoc ) OR ( nuoc sach nghe nghiep tu hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thuat hanh ((phan nghien) OR (phap nghien)) d hoc ) or ( nuoc sach nghe nghiep tu hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( thuat hanh ((phan nghien) OR (phap nghien)) d hoc ) or ( nuoc sach nghe nghiep tu hoc ))*.