Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
hang xa » hoang xa, hang va, hang ca
hieu va » hieu qua
va hanh » van hanh, va thanh, va danh
cao tu » cao thu, co tu, cao su
vi cua » vai cua, di cua
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 ty hang xa hoi. ((hieu va) OR (lieu va)) cao tu va hanh vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty hang xa hoi. ((hieu va) OR (lieu va)) cao tu va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ty hang xa hoi. ((hieu va) OR (lieu va)) cao tu va hanh vi cua te*.