Perhaps you should try some spelling variations:
cham hoc » cham soc, chat hoc, cham hoi
cau tren » cu tren, dau tren, ca tren
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va danh » va dinh, va dan, va hanh
danh va » doanh va, hanh va, anh va
tu sac » tu sach, tu cac, tu san
va cau » van cau, va cac, va dau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ((ky dang) or (ky tang)) xa hoi. hieu ve cham hoc va danh va cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ((ky dang) OR (ky tang)) xa hoi. hieu ve cham hoc va danh va cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sac ((ky dang) or (ky tang)) xa hoi. hieu ve cham hoc va danh va cau tren*.