Perhaps you should try some spelling variations:
trien thi » trieu thi, trien chi, trien khai
sanh tri » thanh tri, dinh tri, minh tri
tue cach » tu cach, thuc cach, ve cach
cach hoc » cach thuc, cach thoi, dich hoc
he trong » he thong, he trung, le trong
tren thi » tran thi, trieu thi, trinh thi
so sach » so sanh, bo sach, co sach
hoc he » hoc hien
anh ha » anh va, anh ta, anh ma
ha he » hoa he, ha le, va he

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( do sanh tri tue cach hoc he trong ) or ( so sach ((trien thi) OR (tren thi)) anh ha he trong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( do sanh tri tue cach hoc he trong ) OR ( so sach ((trien thi) OR (tren thi)) anh ha he trong )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( do sanh tri tue cach hoc he trong ) or ( so sach ((trien thi) OR (tren thi)) anh ha he trong ))".
• Adding a wildcard symbol may retrieve word variants: (( do sanh tri tue cach hoc he trong ) or ( so sach ((trien thi) OR (tren thi)) anh ha he trong ))*.