Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
cac tuc » cac toc, cac tu, cac tac
vai cua » dai cua, hai cua, lai cua
tu sach » su sach, te sach, tu cach
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu van
dan vai » dan va, dan tai, dan vat
hieu va » lieu va, hieu qua
va dan » ca dan, va dao, va dau
cua te » cua tu
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (tu sach)) ky dang xa hoi. ((hieu ve) or (hieu va)) cac tuc va dan vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky dang xa hoi. ((hieu ve) OR (hieu va)) cac tuc va dan vai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) ky dang xa hoi. ((hieu ve) or (hieu va)) cac tuc va dan vai cua te*".