Perhaps you should try some spelling variations:
dang hanh » dang thanh, ban hanh, dang van
can thuc » dan thuc, van thuc, cay thuc
dang tay » dang xay, dung tay, dan tay
dan hanh » dan khanh, dan thanh, ban hanh
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
tay hoi » tay ho, tao hoi, tay thai
cua tuc » cua duc, cua tu, cua thuoc
va can » va chan, va cac, va cao
sach o » sach lo, sac o, sach y
o dang » xo dang, do dang, so dang
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach o dang tay hoi. hieu va can thuc ((dan hanh) OR (dang hanh)) ve ((cua te) or (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach o dang tay hoi. hieu va can thuc ((dan hanh) OR (dang hanh)) ve ((cua te) OR (cua tuc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach o dang tay hoi. hieu va can thuc ((dan hanh) OR (dang hanh)) ve ((cua te) or (cua tuc))".
• Adding a wildcard symbol may retrieve word variants: tu sach o dang tay hoi. hieu va can thuc ((dan hanh) OR (dang hanh)) ve ((cua te) or (cua tuc))*.