Perhaps you should try some spelling variations:
phan tai » pham tai, nhan tai, phan thi
su sach » so sach, vu sach
va phan » van phan, va phat, va phap
va cham » va chat, va tham
ve cham » ve chat, vu cham, ve chim
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
luc va » duc va, tuc va, loc va
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 ((ty nang) OR (ty hang)) xa hoi. hieu ((ve cham) or (va cham)) luc va phan tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ty hang)) xa hoi. hieu ((ve cham) OR (va cham)) luc va phan tai va thiet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty nang) OR (ty hang)) xa hoi. hieu ((ve cham) or (va cham)) luc va phan tai va thiet*".