Perhaps you should try some spelling variations:
hoang van » hang va
sach thu » sach thue, sach thieu, sach tham
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
luu tre » luu tru, cuu tre
soc van » hoc van, oc van, sac van
va cham » va chat, va tham
hieu va » lieu va, hieu qua
mang xa » lang xa, mang may, dang xay
luy tre » luyen tre

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thu ((mang xa) or (hoang van)) hoi. hieu va cham soc van hanh vi ((luu tre) OR (luy tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu ((mang xa) OR (hoang van)) hoi. hieu va cham soc van hanh vi ((luu tre) OR (luy tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu ((mang xa) or (hoang van)) hoi. hieu va cham soc van hanh vi ((luu tre) OR (luy tre))*".