Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ve triet » va trien, su triet
tinh sai » trinh sai, tinh hai, tinh bai
hieu van » hieu va, thien van, lieu va
dang cay » dang ca, dang cac, dung cay
dang xay » dang van, van xay
van cam » van nam, van lam, van cau
va tinh » may tinh
cua tuc » cua duc, cua tu, cua thuoc
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y ((dang cay) OR (dang xay)) phoi. hieu van cam xuc va tinh sai ((ve triet) or (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((dang cay) OR (dang xay)) phoi. hieu van cam xuc va tinh sai ((ve triet) OR (cua tuc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y ((dang cay) OR (dang xay)) phoi. hieu van cam xuc va tinh sai ((ve triet) or (cua tuc))".
• Adding a wildcard symbol may retrieve word variants: toc sach y ((dang cay) OR (dang xay)) phoi. hieu van cam xuc va tinh sai ((ve triet) or (cua tuc))*.