Perhaps you should try some spelling variations:
dong hoa » dong hoc, dong co
hieu thi » sieu thi, hieu chi, kieu thi
hiep thi » tiep thi, dien thi, giap thi
cham luc » cham soc, nhan luc, cham cuu
van hanh » van thanh, ban hanh, van anh
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty dong » tay dong, tu dong, ly dong
hoa hoi » khoa hoi, hoa hoc, hoa doi
luc van » luoc van, luu van, duc van
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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 ty dong hoa hoi. ((hieu thi) OR (hiep thi)) cham luc van hanh va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty dong hoa hoi. ((hieu thi) OR (hiep thi)) cham luc van hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ty dong hoa hoi. ((hieu thi) OR (hiep thi)) cham luc van hanh va cua tre*.