Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
cao suc » cao su, cao duc
buu tre » cuu tre
y nang » ly nang, v nang, may nang

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 ((y nang) or (ky nang)) xa hoi. ((hieu ve) OR (hieu va)) cao suc manh hanh tai buu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ky nang)) xa hoi. ((hieu ve) OR (hieu va)) cao suc manh hanh tai buu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) or (ky nang)) xa hoi. ((hieu ve) OR (hieu va)) cao suc manh hanh tai buu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (ky nang)) xa hoi. ((hieu ve) OR (hieu va)) cao suc manh hanh tai buu tre*.