Perhaps you should try some spelling variations:
phu thong » pho thong, phap thong, khau thong
thuat anh » thuat lanh, thuat canh, thuat nganh
hoc thong » hoc thuong, hoc trong, hoc hong
ki thuat » ky thuat
anh khoa » doanh khoa, hang khoa
khoa hoc » hoa hoc
khoa phu » khoa phau, khoa thu, hoa phu
cac khoa » cac khoan, cac khoi, dac khoa
te sach » toc sach
sach ki » sach kinh, sach bai, sach kem
tu sach » thu sach, su sach, tu cach
xa hoc » va hoc, xa hoa, ta hoc

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 ki thuat anh khoa hoc thong ) or ( tu sach ((xa hoc) OR (xa hoi)) cac khoa phu thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach ki thuat anh khoa hoc thong ) OR ( tu sach ((xa hoc) OR (xa hoi)) cac khoa phu thong )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( te sach ki thuat anh khoa hoc thong ) or ( tu sach ((xa hoc) OR (xa hoi)) cac khoa phu thong ))".
• Adding a wildcard symbol may retrieve word variants: (( te sach ki thuat anh khoa hoc thong ) or ( tu sach ((xa hoc) OR (xa hoi)) cac khoa phu thong ))*.