Perhaps you should try some spelling variations:
kham thong » khap thong, khau thong, pham thuong
khoa kham » kho khan, khoa than
sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
thuc bach » truc bach, thuc cach, thuoc sach
phu thong » pho thong, phap thong, khau thong
cach tri » cach thoi, cac tro, cach noi
tri thuc » tri tue
thuc cac » thuc cach, tuc cac, phuc cac
cac khoa » cac khoan, cac khoi, dac khoa
hoc sach » hoc sinh, hoc cac, hoc anh
tu cach » tu cac
bach ha » bac ha, bich ha, sach ha
ha phu » hai phu, hoa phu, ha pha

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu cach tri thuc cac khoa kham thong ) or ( hoc sach tren thuc bach ha phu thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cach tri thuc cac khoa kham thong ) OR ( hoc sach tren thuc bach ha phu thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu cach tri thuc cac khoa kham thong ) or ( hoc sach tren thuc bach ha phu thong ))*.