Perhaps you should try some spelling variations:
cau tren » cu tren, ca tren, cau treo
dau tren » dau tien, dat tren, dau tieng
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va tinh » may tinh
tinh di » tinh doi, trinh di, tinh da
tu dan » tuc dan, tu ban, cu dan
dan ky » van ky
ma hoi » mai hoi, ma hoa, me hoi
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu dan ky nang ((ma hoi) or (xa hoi)). hieu va cam duc va tinh di ((cau tren) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu dan ky nang ((ma hoi) OR (xa hoi)). hieu va cam duc va tinh di ((cau tren) OR (dau tren)).
• Adding a wildcard symbol may retrieve word variants: tu dan ky nang ((ma hoi) or (xa hoi)). hieu va cam duc va tinh di ((cau tren) or (dau tren))*.