Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
trien thuc » trien thuoc, tren thuc, trien thuat
kham thong » khap thong, khau thong, pham thuong
thuc hang » thuc hanh, thu hang, phuc hang
hang khoa » dung khoa
khoa kham » kho khan, khoa than
sach truc » cach thuc, sach tren, sach thu
can khoan » cac khoan, toan khoan, san khoa
khoan pho » khoan nhoi, khoan phai, khoan hoi
pho thong » he thong
truc phu » thuc phu, tuc phu, truc chua
tu sach » thu sach, su sach, te sach
phu can » phu san, pho can, phu chuan

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 trien thuc hang khoa kham thong ) or ( tu sach truc phu can khoan pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach trien thuc hang khoa kham thong ) OR ( tu sach truc phu can khoan pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach trien thuc hang khoa kham thong ) or ( tu sach truc phu can khoan pho thong ))*.