Perhaps you should try some spelling variations:
cham hoi » cham voi, cham h'roi, pham hoai
cham hoc » cham soc, chat hoc, cho hoc
cuu tre » cua tre, cau tren, cau treo
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
hieu va » lieu va, hieu qua
ky tang » ky nang, kho tang, ky trong
ky dang » ky nang, ky danh
vi cuu » vi luu, vinh cuu
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 va ((cham hoc) OR (cham hoi)) va danh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ((ky dang) OR (ky tang)) xa hoi. hieu va ((cham hoc) OR (cham hoi)) va danh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ((ky dang) or (ky tang)) xa hoi. hieu va ((cham hoc) OR (cham hoi)) va danh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ((ky dang) or (ky tang)) xa hoi. hieu va ((cham hoc) OR (cham hoi)) va danh vi cuu tre*.