Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
cao xuc » cao duc, cao suc, chat xuc
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu
thiet » thieu

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 ty nang ma hoi. hieu va ((cao xuc) OR (cam xuc)) va hanh vi ((cua te) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang ma hoi. hieu va ((cao xuc) OR (cam xuc)) va hanh vi ((cua te) OR (va thiet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang ma hoi. hieu va ((cao xuc) OR (cam xuc)) va hanh vi ((cua te) or (va thiet))*".