Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham xuc » cam xuc, chat xuc, cham soc
han thai » han tai, van thai, than thoai
ban thai » ban than, ban thi, ban tai
su sach » so sach, vu sach
nang xa » lang xa, nang ma, mang xa
xuc va » duc va, tuc va, luc va
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((nang xa) or (nang x)) hoi. hieu van cham xuc va ((han thai) OR (ban thai)) va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (nang x)) hoi. hieu van cham xuc va ((han thai) OR (ban thai)) va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) or (nang x)) hoi. hieu van cham xuc va ((han thai) OR (ban thai)) va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (nang x)) hoi. hieu van cham xuc va ((han thai) OR (ban thai)) va thiet*.