Perhaps you should try some spelling variations:
cham hoc » cham soc, chat hoc, cham hoi
vinh cua » sinh cua, dinh cua, vinh cuu
tinh cua » trinh cua, sinh cua, tinh chat
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 dinh » van dinh, va kinh, va tinh
tu sac » tu sach, tu cac, tu san

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 dinh ((vinh cua) OR (tinh cua)) tre~.
• 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 dinh ((vinh cua) OR (tinh cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ((ky dang) or (ky tang)) xa hoi. hieu ve cham hoc va dinh ((vinh cua) OR (tinh cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ((ky dang) or (ky tang)) xa hoi. hieu ve cham hoc va dinh ((vinh cua) OR (tinh cua)) tre*.