Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang cay » dang xay, dang ca, dang cac
cay phoi » cap phoi, tay hoi, cay cho
hieu van » hieu va, thien van, lieu va
ve triet » va trien, su triet
dinh sai » dinh tai, danh sai, dinh hai
cua tuc » cua duc, cua tu, cua thuoc
van cam » van nam, van lam, van cau
tuc va » thuc va, truc va, tuc xa
y dang » ky dang, 2 dang, _ dang
xuc va » duc va, luc va, xac 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 phoi. hieu van cam ((xuc va) OR (tuc va)) dinh sai ((ve triet) or (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y dang cay phoi. hieu van cam ((xuc va) OR (tuc va)) dinh sai ((ve triet) OR (cua tuc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y dang cay phoi. hieu van cam ((xuc va) OR (tuc va)) dinh sai ((ve triet) or (cua tuc))".
• Adding a wildcard symbol may retrieve word variants: toc sach y dang cay phoi. hieu van cam ((xuc va) OR (tuc va)) dinh sai ((ve triet) or (cua tuc))*.