Perhaps you should try some spelling variations:
phan tai » pham tai, nhan tai, phan thi
van phan » van phong, van thanh, luan phan
su sach » so sach, vu sach
xuc van » duc van, luc van, vuc van
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
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: su sach ky ((lang xa) or (nang x)) hoi. hieu ((ve cam) OR (va cam)) xuc van phan tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((lang xa) OR (nang x)) hoi. hieu ((ve cam) OR (va cam)) xuc van phan tai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((lang xa) or (nang x)) hoi. hieu ((ve cam) OR (va cam)) xuc van phan tai va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((lang xa) or (nang x)) hoi. hieu ((ve cam) OR (va cam)) xuc van phan tai va thiet*.