Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dang xay » dang van, van xay
nam thuc » nam thuoc, am thuc, nam thu
sach thu » sach thue, sach thieu, sach tham
hieu cua » hieu qua, dieu cua, bieu cua
lang xa » lang ha, lang van
cua nam » cua tam, cua ngan, cua nhan
vat dao » va dao, van dao, vat da
cua tre » cua te, cuu tre, dua tren
su sach » so sach, vu sach
dao va » dao van, tao va, do va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thu ((lang xa) or (dang xay)) hoi. hieu cua nam thuc vat dao va ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu ((lang xa) OR (dang xay)) hoi. hieu cua nam thuc vat dao va ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu ((lang xa) or (dang xay)) hoi. hieu cua nam thuc vat dao va ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach thu ((lang xa) or (dang xay)) hoi. hieu cua nam thuc vat dao va ((cua tre) OR (cua triet))*.