Perhaps you should try some spelling variations:
phu thong » pho thong, phap thong, khau thong
sach dao » lanh dao
dao thuc » dan thuc, dao tuc, do thuc
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
khoa phu » khoa phau, khoa thu, hoa phu
huy bach » huu bach, huy bich, vu bach
tu sach » thu sach, su sach, te sach
goc thi » goc nhin, hoc thai, ngoc thu
thi huy » thi thuy, thi hue, thi huu
khoa he » hoa he, khoa hoc, khong he
tu goc » tu hoc

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 dao thuc anh khoa phu thong ) or ( tu goc thi huy bach khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach dao thuc anh khoa phu thong ) OR ( tu goc thi huy bach khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach dao thuc anh khoa phu thong ) or ( tu goc thi huy bach khoa he thong ))*.