Perhaps you should try some spelling variations:
he trong » he thong, he trung, le trong
sanh tri » thanh tri, dinh tri, minh tri
sach dao » lanh dao
thi anh » thi hanh, thi thanh, thich anh
dao thi » do thi, dan thi, dang thi
bo sach » co sach, hoc sach
so sanh » do sanh
tu cach » tu cac
ve cach » va cach, ve cac, ve canh
anh ha » anh va, anh ta, anh ma
ha 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: (( so sanh tri ((ve cach) or (tu cach)) hoa he trong ) or ( bo sach dao thi anh ha he trong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh tri ((ve cach) OR (tu cach)) hoa he trong ) OR ( bo sach dao thi anh ha he trong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh tri ((ve cach) or (tu cach)) hoa he trong ) or ( bo sach dao thi anh ha he trong ))*.