Perhaps you should try some spelling variations:
khoa thong » hoa thong, thoai thong, pho thong
thuat mach » thuat sach, thuat tach, thuyet mach
mach khoa » bach khoa, anh khoa, may khoa
phu thong » pho thong, phap thong, khau thong
sinh hoat » sinh hoc, sinh vat
hoat khoa » hoa khoa, thoat khoi, toan khoa
ki thuat » ky thuat
khoa phu » khoa phau, khoa thu, hoa phu
sach tri » sach tai, sach tren, sach truc
thu sinh » thu minh, thu kinh, thuoc sinh
tu sach » thu sach, su sach, te sach
sach ki » sach kinh, sach bai, sach kem
tri thu » tri thuc, thi thu, tri phu

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach ki thuat mach khoa phu thong ) or ( tu sach tri thu sinh hoat khoa thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach ki thuat mach khoa phu thong ) OR ( tu sach tri thu sinh hoat khoa thong ))*.