Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
cau cuu » cap cuu, cau cua, cau chu
van cau » van dau, van hau, van chat
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
tu sach » su sach, te sach, tu cach
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: ((thu sach) OR (tu sach)) ((ty nang) or (ty hang)) x ho. hieu van cau cuu van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ((ty nang) OR (ty hang)) x ho. hieu van cau cuu van hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) ((ty nang) or (ty hang)) x ho. hieu van cau cuu van hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) ((ty nang) or (ty hang)) x ho. hieu van cau cuu van hanh vi cua te*.