Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh dat » thanh san, thanh hai, thanh van
sieu viet » su viet, dien viet, bien viet
xa thanh » va thanh, ha thanh, ta thanh
suu viet » su viet, sau viet, so viet
dang ma » dang mau, dang mam, dang mat
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
ma hoi » mai hoi, xa hoi, ma hoa
co toc » cao toc, co doc, co toi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky dang ma hoi. hieu va ((co toc) or (co hoc)) xa thanh dat ((suu viet) OR (sieu viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky dang ma hoi. hieu va ((co toc) OR (co hoc)) xa thanh dat ((suu viet) OR (sieu viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky dang ma hoi. hieu va ((co toc) or (co hoc)) xa thanh dat ((suu viet) OR (sieu viet))".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky dang ma hoi. hieu va ((co toc) or (co hoc)) xa thanh dat ((suu viet) OR (sieu viet))*.