Perhaps you should try some spelling variations:
hoach toi » hoach hoi, hoach toan, hoach do
khoa khoi » khoa hoi, khoa khoa, thoat khoi
thieu thu » tieu thu, thi thu, thieu nhi
pho thong » he thong
han khoa » hang khoa, nhan khoa, san khoa
anh khoa » doanh khoa, hang khoa
khoa pho » khoa phu, khoa khoa, khoa phau
tu sach » thu sach, su sach, te sach
thu anh » thuy anh, thu canh, thu oanh
toi su » thoi su, toi uu, oi su
su han » su phan, su hoan, su van
khong » phong

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu hoach toi su han khoa khoi khong ) or ( tu sach thieu thu anh khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach toi su han khoa khoi khong ) OR ( tu sach thieu thu anh khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu hoach toi su han khoa khoi khong ) or ( tu sach thieu thu anh khoa pho thong ))*.