Perhaps you should try some spelling variations:
sach trien » sach tien, sach thieu, cach thien
trien thuc » trien thuoc, trien thuat, kien thuc
sach tren » sach tien, sach tranh
tren thuc » tron thuc, trinh thuc, trong thuc
hanh thoi » hanh thuoc, nhanh thai, hanh noi
phu thong » pho thong, phap thong, khau thong
doi thong » doi thuong, doi tuong, doi trong
thu sach » tu sach, thuat sach, thuoc sach
thoi phu » thi phu, hoi phu, thon phu
thuc cac » thuc cach, tuc cac, phuc cac
cac khoa » cac khoan, cac khoi, dac khoa
khoa doi » hoa doi, khoa hoi, khoa noi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu sach tren thuc hanh thoi phu thong ) or ( thu sach trien thuc cac khoa doi thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach tren thuc hanh thoi phu thong ) OR ( thu sach trien thuc cac khoa doi thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu sach tren thuc hanh thoi phu thong ) or ( thu sach trien thuc cac khoa doi thong ))*.