Perhaps you should try some spelling variations:
su sach » so sach, vu sach
cac tuc » cac toc, cac tu, cac tac
vat cua » mat cua, bat cua, dat cua
ky dang » ky nang, ky danh
mat hoi » mai hoi, sat hoi, mat troi
hieu ve » hieu van
dan vat » dang vat, van vat, dan va
hieu va » lieu va, hieu qua
ca dan » cac dan, ca dao
cua te » cua tu
tuc ca » tuc cac, tuc cua, tuc xa
y dang » 2 dang, _ dang, b dang

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 ((y dang) OR (ky dang)) mat hoi. ((hieu ve) or (hieu va)) cac tuc ca dan vat cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y dang) OR (ky dang)) mat hoi. ((hieu ve) OR (hieu va)) cac tuc ca dan vat cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y dang) OR (ky dang)) mat hoi. ((hieu ve) or (hieu va)) cac tuc ca dan vat cua te*".