Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
pho thong » he thong
sach tren » sach tien, sach tranh
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
khoa pho » khoa phu, khoa khoa, khoa phau
tren thi » trien thi, tran thi, trieu thi
thi quoc » thu quoc, tai quoc, thi nuoc
hoi khau » thoi khac, hoi chu, hoi khoa
tu sach » thu sach, su sach, te sach

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 tham thuc anh khoa pho thong ) or ( tu sach tren thi quoc hoi khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tham thuc anh khoa pho thong ) OR ( tu sach tren thi quoc hoi khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tham thuc anh khoa pho thong ) or ( tu sach tren thi quoc hoi khau thong ))*.