Perhaps you should try some spelling variations:
van thai » van thoai, van tai, van hai
han thai » han tai, ban thai, than thoai
su sach » so sach, vu sach
vu kham » vu khanh
xuc van » duc van, luc van, vuc van
sach ty » sach y, sach tu, sach thu
ve cham » va cham, ve chat, vu cham
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
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 xa hoi. hieu ((ve cham) or (vu kham)) xuc van ((han thai) OR (van thai)) va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu ((ve cham) OR (vu kham)) xuc van ((han thai) OR (van thai)) va thiet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. hieu ((ve cham) or (vu kham)) xuc van ((han thai) OR (van thai)) va thiet*".