Perhaps you should try some spelling variations:
cau tren » cu tren, ca tren, cau treo
dau tren » dau tien, dat tren, dau tieng
qua cam » qua cham, qua cac, qua ca
cam duc » cam xuc, cao duc, pham duc
va tinh » may tinh
tinh da » tinh va, tinh gia, tinh lao
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
ma hoi » mai hoi, ma hoa, me hoi

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

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