Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
khoa hoc » hoa hoc
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cho hoc » co hoc
hieu va » hieu qua
cao xuc » cam xuc, cao duc, cao suc
xuc van » duc van, luc van, vuc van
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ty nang ((cho hoc) or (khoa hoc)). ((hieu va) OR (lieu va)) cao xuc van hanh vi cua cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ty nang ((cho hoc) OR (khoa hoc)). ((hieu va) OR (lieu va)) cao xuc van hanh vi cua cac*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ty nang ((cho hoc) or (khoa hoc)). ((hieu va) OR (lieu va)) cao xuc van hanh vi cua cac*".