Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
toc sach » hoc sach, doc sach, thuoc sach
cham xuc » cam xuc, chat xuc, cham soc
xuc van » duc van, luc van, vuc van
va cham » va chat, va tham
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
nang xa » nang x, lang xa, nang ma
su viet » so viet
vi su » va su, ve su, ki su

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) OR (toc sach)) v ((nang xa) or (tang ma)) hoi. hieu va cham xuc van hanh vi su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) v ((nang xa) OR (tang ma)) hoi. hieu va cham xuc van hanh vi su viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) v ((nang xa) or (tang ma)) hoi. hieu va cham xuc van hanh vi su viet*".