Perhaps you should try some spelling variations:
sach tranh » canh tranh
tranh thuc » trinh thuc, trang thuc, thanh thuy
xanh khong » nganh khong, anh thong, benh khong
thuc xanh » thuc hanh, thuc thanh, thuc dan
sach tren » sach tien
tren thuc » trien thuc, tron thuc, trinh thuc
khong he » khong khi, hong ha, khong _
thu sach » thuat sach, thuoc sach, thu hoach
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
he trung » le trung, do trung
tu sach » su sach, te sach, tu cach
khoa he » hoa he, khoa hoc, khoa thu

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 tranh thuc xanh khong he thong ) or ( thu sach tren thuc anh khoa he trung ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tranh thuc xanh khong he thong ) OR ( thu sach tren thuc anh khoa he trung )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tranh thuc xanh khong he thong ) or ( thu sach tren thuc anh khoa he trung ))*.