Perhaps you should try some spelling variations:
phan nghien » phap nghien, luan nghien
thuat lanh » thuat san
thuat lap » thuat xay, thuat bai, thuat bao
nuoc sach » nguoi sach, hoc sach, cuoc cach
sach nghe » sach nghiep, sach nha, anh nghe
nghiep tu » nghiep vu, nghiep vua, nghiep cua
nghien d » nghiem d, nghien o, nghiem de
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 lanh) OR (thuat lap)) phan nghien d hoc ) or ( nuoc sach nghe nghiep tu hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((thuat lanh) OR (thuat lap)) phan nghien d hoc ) OR ( nuoc sach nghe nghiep tu hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((thuat lanh) OR (thuat lap)) phan nghien d hoc ) or ( nuoc sach nghe nghiep tu hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( ((thuat lanh) OR (thuat lap)) phan nghien d hoc ) or ( nuoc sach nghe nghiep tu hoc ))*.