Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, van anh, van ban
tru nang » tra nang, tri nang, truc nano
ban hanh » ban hang
sach tru » sach truc, sach thu, sach tu
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu van
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tru nang ma hoi. ((hieu ve) OR (hieu va)) cam xuc ((van hanh) or (ban hanh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tru nang ma hoi. ((hieu ve) OR (hieu va)) cam xuc ((van hanh) OR (ban hanh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tru nang ma hoi. ((hieu ve) OR (hieu va)) cam xuc ((van hanh) or (ban hanh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach tru nang ma hoi. ((hieu ve) OR (hieu va)) cam xuc ((van hanh) or (ban hanh)) vi cua te*.