Perhaps you should try some spelling variations:
khoan khau » khoanh khac, khoa kham, khoa phau
khau thong » khau thuong, khap thong, khau tong
hoach toi » hoach hoi, hoach toan, hoach do
hoc thong » hoc thuong, hoc trong, hoc hong
sach tri » sach tai, sach tren, sach truc
tri thuc » tri tue
thuc cac » thuc cach, tuc cac, phuc cac
thi bach » thi bich, thi hanh, thi anh
bach hoa » bach khoa, bach ha, cach hoan
so sach » so sanh, bo sach, co sach
toi thi » hoi thi, tai thi, thi thi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sach tri thuc cac khoan khau thong ) or ( thu hoach toi thi bach hoa hoc thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach tri thuc cac khoan khau thong ) OR ( thu hoach toi thi bach hoa hoc thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sach tri thuc cac khoan khau thong ) or ( thu hoach toi thi bach hoa hoc thong ))*.