Perhaps you should try some spelling variations:
cuu thuc » cuu tac
thanh ve » hanh ve, thanh va, thanh vien
dang xay » dang van, van xay
va cham » va chat, va tham
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
lang ha » long ha
hieu va » lieu va, hieu qua
xac va » tac va, ac va, bac va
ve cuu » ve cau, ve chu, ve cua

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 ky ((dang xay) or (lang ha)) hoi. hieu va cham ((xac va) or (duc va)) thanh ve cuu thuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((dang xay) OR (lang ha)) hoi. hieu va cham ((xac va) OR (duc va)) thanh ve cuu thuc.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((dang xay) or (lang ha)) hoi. hieu va cham ((xac va) or (duc va)) thanh ve cuu thuc*.