Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
mang xa » mang may, dang xay, mang cua
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
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 thieu ((mang xa) or (lang xa)) hoi. ((hieu van) OR (hieu va)) cam luc van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thieu ((mang xa) OR (lang xa)) hoi. ((hieu van) OR (hieu va)) cam luc van hanh vi cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thieu ((mang xa) or (lang xa)) hoi. ((hieu van) OR (hieu va)) cam luc van hanh vi cua te*".