Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
may thoi » gay thoi, may thi, tay thoi
va thanh » gia thanh, ban thanh, va tinh
sach ky » sac ky, sach y, sach kem
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
may hoi » tay hoi, mai hoi, may hmi
sach ty » sach y, sach tu, sach thu
su viet » so viet
tuc va » thuc va, truc va, tuc xa
dat su » sat su

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 ky) OR (sach ty)) mang ((may hoi) or (may thoi)). hieu va cac tuc va thanh dat su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) mang ((may hoi) OR (may thoi)). hieu va cac tuc va thanh dat su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach ty)) mang ((may hoi) or (may thoi)). hieu va cac tuc va thanh dat su viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach ty)) mang ((may hoi) or (may thoi)). hieu va cac tuc va thanh dat su viet*.