Perhaps you should try some spelling variations:
phan thuong » hang thuong, phan xuong
tren thuoc » trien thuoc, tren thuc, trung thuoc
thuoc sach » hoc sach, nuoc sach, thuat sach
theo sach » te sach, theo lich, thu sach
sach tren » sach tien, sach tranh
thuat anh » thuat lanh, thuat canh, thuat nganh
sach hoa » sach ha, sach hoi, bach hoa
hoa phan » hoa dan, co phan
hoach ki » hoach hoi, hoach toi, hoach su
ki thuat » ky thuat
anh nghe » lang nghe, nang nghe, van nghe
nghe he » nghe che, nghe ha, nghe te
thong » trong

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( theo sach tren thuoc sach hoa phan thuong ) or ( thu hoach ki thuat anh nghe he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( theo sach tren thuoc sach hoa phan thuong ) OR ( thu hoach ki thuat anh nghe he thong )).
• Adding a wildcard symbol may retrieve word variants: (( theo sach tren thuoc sach hoa phan thuong ) or ( thu hoach ki thuat anh nghe he thong ))*.