Perhaps you should try some spelling variations:
cam truc » cau truc, nam truc, lam truoc
dong hoa » dong hoc, dong co
dang xay » dang van, van xay
te sach » toc sach
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cua duc » cua tuc, cua nuoc, cua quoc
hieu ve » hieu va, hieu van
sach o » sach lo, sac o, sach y
vi cua » vai cua, di cua
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach o ((dong hoa) or (dang xay)) hoi. hieu ve cam truc ((va hanh) OR (va danh)) vi cua duc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach o ((dong hoa) OR (dang xay)) hoi. hieu ve cam truc ((va hanh) OR (va danh)) vi cua duc*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach o ((dong hoa) or (dang xay)) hoi. hieu ve cam truc ((va hanh) OR (va danh)) vi cua duc*".