Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
vu kham » vu khanh
san cau » van cau, ban cau, can cau
hoc van » hoc dan, hoc va, hoc vat
soc van » oc van, sac van, soc dan
hieu vu » hieu va, hieu ve, hieu su
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
ha hoi » hoa hoi, ha noi, va hoi
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 ((ha hoi) OR (xa hoi)). hieu vu kham ((soc van) or (hoc van)) thanh san cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky dang ((ha hoi) OR (xa hoi)). hieu vu kham ((soc van) OR (hoc van)) thanh san cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky dang ((ha hoi) OR (xa hoi)). hieu vu kham ((soc van) or (hoc van)) thanh san cau treo".
• Adding a wildcard symbol may retrieve word variants: tu sac ky dang ((ha hoi) OR (xa hoi)). hieu vu kham ((soc van) or (hoc van)) thanh san cau treo*.