Perhaps you should try some spelling variations:
phan tai » pham tai, nhan tai, phan thi
van phan » van phong, van thanh, luan phan
vu sach » vu bach, su sach, vu khach
va cham » va chat, va tham
xuc van » duc van, luc van, vuc van
ve chat » va chat, van chat
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
tai va » thai va, mai va, tri 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: vu sach ky ((nang xa) or (lang xa)) hoi. hieu ((ve chat) or (va cham)) xuc van phan tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((nang xa) OR (lang xa)) hoi. hieu ((ve chat) OR (va cham)) xuc van phan tai va thiet.
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((nang xa) or (lang xa)) hoi. hieu ((ve chat) or (va cham)) xuc van phan tai va thiet*.