Perhaps you should try some spelling variations:
van thai » van thoai, van tai, van thi
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
ve cham » va cham, ve chat, ve chim
vu cham » va cham, vu kham, tu cham
van hai » van ha, van chat, van hanh
loc va » hoc 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: so sach ty nang xa hoi. hieu ((ve cham) or (vu cham)) loc va ((van thai) OR (van hai)) va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang xa hoi. hieu ((ve cham) OR (vu cham)) loc va ((van thai) OR (van hai)) va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang xa hoi. hieu ((ve cham) or (vu cham)) loc va ((van thai) OR (van hai)) va thiet".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang xa hoi. hieu ((ve cham) or (vu cham)) loc va ((van thai) OR (van hai)) va thiet*.