Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
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: tu sach ty nang x ho. ((hieu van) or (thien van)) cap cuu van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x ho. ((hieu van) OR (thien van)) cap cuu van hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x ho. ((hieu van) or (thien van)) cap cuu van hanh vi cua te*.